BCR (personal handicaps)

Imported from Yahoo
1

Can someone walk me through the process of the BCR as the club I am at uses personal handicaps all the time, at the moment they are doing it all on excel but it makes more sense to me to do it on sailwave as it saves entering all the info twice, but I have no idea how to do this, and therefore need some help please.

Many Thanks

···

–
Mark Russell
Sailing Instructor

Royal Brunei Yacht Club

+6737161688

rbycsailinginstructor@gmail.com

admin.rbyc@gmail.com

2

Unless I am missing something, Back Calculated Rating (to win) does just that: it calculates the rating that a particular boat would have needed to have sailed with to have equalled the corrected time of the winning boat.

There are various ways of getting the BCRs into a spreadsheet: exporting the relevant bits into Windows clipboard then pasting into a spreadsheet is one, copy and paste from a browser is another.

The tricky bit is how you use the BCR data :wink:

HTH

Mike

Lancing SC

···

— In sailwave@yahoogroups.com, Mark Russell <mark.russ1977@…> wrote:

Can someone walk me through the process of the BCR

3

Hi,
I am in the same boat. I need to work out how to use sailwave to calculate personal handicaps from the elapsed times, preferably using the results of a whole series to produce average handicapes. Has anyone got an idiot's guide?

Roger Wilson
Lymington

4

Mike points out a critical element here - it is important how you use the BCR data (BCR is what rating or handicap a boat would need to tie the winning boat).

The "BCR" makes every boat except one (the actual winner) appear slower (a lower TOT TCF or a higher TOD rating). Thus, over time all boats that sail and have their ratings adjusted will appear slower and slower. A new boat entering the series with a "standard" rating would then be at a disadvantage (which could be significant if the BCRs have been used for awhile) since their "normal" rating will be much faster than the average rating among the boats that have been adjusted. If you don't mind this as a problem then by all means use the BCRs. Locally, we find that unacceptable and instead adjust all boats to the "median" boat - that means boats above the median get "faster" while those below the median get "slower." Then a new boat with a "normal" rating will be the same as the average among the boats that have been adjusted.

For the record, the "median" boat is the exact middle when there an odd number of boats and the average between the middle two when there are an even number of boats.

Art Engel

···

On 2/1/2011 12:47 AM, Mike wrote:

--- In sailwave@yahoogroups.com, Mark Russell<mark.russ1977@...> wrote:

Can someone walk me through the process of the BCR

Unless I am missing something, Back Calculated Rating (to win) does just
that: it calculates the rating that a particular boat would have needed
to have sailed with to have equalled the corrected time of the winning
boat.There are various ways of getting the BCRs into a spreadsheet:
exporting the relevant bits into Windows clipboard then pasting into a
spreadsheet is one, copy and paste from a browser is another.The tricky
bit is how you use the BCR data ;)HTHMikeLancing SC

5

NB: In case anybody needs it - you can choose
the median boat (or any other % between 0 and 100) to base BCR on
in Sailwave. See Back Calculated Index in the “rating system” tab
of a scoring system.

··· 
Regards,
Colin J

www.sailwave.com


Mike points out a critical element here - it is important how you use the BCR data (BCR is what rating or handicap a boat would need to tie the winning boat).
The "BCR" makes every boat except one (the actual winner) appear slower (a lower TOT TCF or a higher TOD rating). Thus, over time all boats that sail and have their ratings adjusted will appear slower and slower. A new boat entering the series with a "standard" rating would then be at a disadvantage (which could be significant if the BCRs have been used for awhile) since their "normal" rating will be much faster than the average rating among the boats that have been adjusted. If you don't mind this as a problem then by all means use the BCRs. Locally, we find that unacceptable and instead adjust all boats to the "median" boat - that means boats above the median get "faster" while those below the median get "slower." Then a new boat with a "normal" rating will be the same as the average among the boats that have been adjusted.
For the record, the "median" boat is the exact middle when there an odd number of boats and the average between the middle two when there are an even number of boats.
Art Engel
On 2/1/2011 12:47 AM, Mike wrote:

--- In , Mark Russell wrote:

Can someone walk me through the process of the BCR

Unless I am missing something, Back Calculated Rating (to win) does just
that: it calculates the rating that a particular boat would have needed
to have sailed with to have equalled the corrected time of the winning
boat.There are various ways of getting the BCRs into a spreadsheet:
exporting the relevant bits into Windows clipboard then pasting into a
spreadsheet is one, copy and paste from a browser is another.The tricky
bit is how you use the BCR data ;)HTHMikeLancing SC


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6

Thanks to Colin for pointing out that BCR can refer to any % position in the results: I'd forgotten that.
My original intention was to hint at the difficulties you, as handicapper, will come across as you attempt to administer a PH system, especially a dynamic one that changes handicaps on a race by race basis.
Obvious pratfalls are handling people that capsized a lot (usually a very slow process, but much slower in some classes than others e.g. Laser upwind vs twin-wire skiff off-wind), large wind changes favouring one half of the fleet, spring tides favouring faster boats etc. etc..
IME you also never have enough data to do a thorough job! (Although at the time it doesn't seem like it.)
After trying various approaches, we currently use a golf handicap system at Lancing SC for our Wednesday Evening Series. Handicaps set by the handicapper at the beginning of the season after consultation with fleet captains, with minor trimming during the year if obvious bias (due to secret winter training or new sails, etc.) becomes apparent. As handicapper I look at the distribution of BCR, especially the outliers: if someone keeps on appearing near either end then their handicap is adjusted.
Despite the above, I also calculate a set of PY results using aliases, just to keep the traditionalists happy :wink: (Prizes only for PH, though.)
Good luck - you'll need it!

···

--- In sailwave@yahoogroups.com, Art Engel <artengel123@...> wrote:

Mike points out a critical element here - it is important how you use
the BCR data (BCR is what rating or handicap a boat would need to tie
the winning boat).

7

Hi Roger and All, I'm not sure sailwave can do this efficiently at present. We use a system which uses the mean result (the best measure of central tendancy) as the comparative boat. Now this boat is more than likely a fictitious boat but it is the most accurate "standard" for the fleet on the day. The BCH or BCR (same meaning) is the handicap each yacht would need to have been on for that race for them all to finish equal on corrected time. For the next race the new handicap is based on the BCH or BCR. Actually we average the last four BCHs or BCRs to take some of the volatility out of it. There are also provisions to ignore a result that is totally wayward. It would be great if some such system could be built into Sailwave.

Albert Reynolds
Brisbane

···

--- In sailwave@yahoogroups.com, "Roger" <rogermbwilson@...> wrote:

Hi,
I am in the same boat. I need to work out how to use sailwave to calculate personal handicaps from the elapsed times, preferably using the results of a whole series to produce average handicapes. Has anyone got an idiot's guide?

Roger Wilson
Lymington

8

Hi Roger

I have an application that can be used to publish from a Sailwave series that will generate a csv file containing the average BCR's.

Let me know if you'd like a copy.

cheers
Tony

···

At 13:24 20/02/2012, albert.reynolds70 wrote:

--- In <mailto:sailwave%40yahoogroups.com>sailwave@yahoogroups.com, "Roger" <rogermbwilson@...> wrote:
>
> Hi,
> I am in the same boat. I need to work out how to use sailwave to calculate personal handicaps from the elapsed times, preferably using the results of a whole series to produce average handicapes. Has anyone got an idiot's guide?
>
> Roger Wilson
> Lymington
>
Hi Roger and All, I'm not sure sailwave can do this efficiently at present. We use a system which uses the mean result (the best measure of central tendancy) as the comparative boat. Now this boat is more than likely a fictitious boat but it is the most accurate "standard" for the fleet on the day. The BCH or BCR (same meaning) is the handicap each yacht would need to have been on for that race for them all to finish equal on corrected time. For the next race the new handicap is based on the BCH or BCR. Actually we average the last four BCHs or BCRs to take some of the volatility out of it. There are also provisions to ignore a result that is totally wayward. It would be great if some such system could be built into Sailwave.

Albert Reynolds
Brisbane

9

Tony.

This is something I am interested in too as we are hoping to introduce something similar in our club this year.

Joe

···

--- In sailwave@yahoogroups.com, Tony Tucker <tony@...> wrote:

Hi Roger

I have an application that can be used to publish
from a Sailwave series that will generate a csv
file containing the average BCR's.

Let me know if you'd like a copy.

cheers
Tony

At 13:24 20/02/2012, albert.reynolds70 wrote:
>
>
>
>
>--- In
><mailto:sailwave%40yahoogroups.com>sailwave@yahoogroups.com,
>"Roger" <rogermbwilson@> wrote:
> >
> >
> > Hi,
> > I am in the same boat. I need to work out how
> to use sailwave to calculate personal handicaps
> from the elapsed times, preferably using the
> results of a whole series to produce average
> handicapes. Has anyone got an idiot's guide?
> >
> > Roger Wilson
> > Lymington
> >
>Hi Roger and All, I'm not sure sailwave can do
>this efficiently at present. We use a system
>which uses the mean result (the best measure of
>central tendancy) as the comparative boat. Now
>this boat is more than likely a fictitious boat
>but it is the most accurate "standard" for the
>fleet on the day. The BCH or BCR (same meaning)
>is the handicap each yacht would need to have
>been on for that race for them all to finish
>equal on corrected time. For the next race the
>new handicap is based on the BCH or BCR.
>Actually we average the last four BCHs or BCRs
>to take some of the volatility out of it. There
>are also provisions to ignore a result that is
>totally wayward. It would be great if some such
>system could be built into Sailwave.
>
>Albert Reynolds
>Brisbane
>
>

10

Tony,

I would also be interested as we do this now with another program (custom) and are investigating moving to Sailwave. As Albert mentioned, we think the middle boat (technically called the "median") is the best way to go. We also are considering going back multiple races.

Perhaps this could be posted in the files section of the SUG. Otherwise, I'd like a copy directly.

Presumably, this could be done easily in Excel but I haven't yet tried to create a spreadsheet.

Art

PS - Sailwave can handle back correcting from the first or last boat using either 0% or 100% in the input box. With anything else the calculation seems to be messed up and there is no predicting which boat it will use as the "base" boat.

···

On 2/20/2012 5:50 AM, Tony Tucker wrote:

Hi Roger

I have an application that can be used to publish
from a Sailwave series that will generate a csv
file containing the average BCR's.

Let me know if you'd like a copy.

cheers
Tony

At 13:24 20/02/2012, albert.reynolds70 wrote:

--- In
<mailto:sailwave%40yahoogroups.com>sailwave@yahoogroups.com,
"Roger"<rogermbwilson@...> wrote:

Hi,
I am in the same boat. I need to work out how

to use sailwave to calculate personal handicaps
from the elapsed times, preferably using the
results of a whole series to produce average
handicapes. Has anyone got an idiot's guide?

Roger Wilson
Lymington

Hi Roger and All, I'm not sure sailwave can do
this efficiently at present. We use a system
which uses the mean result (the best measure of
central tendancy) as the comparative boat. Now
this boat is more than likely a fictitious boat
but it is the most accurate "standard" for the
fleet on the day. The BCH or BCR (same meaning)
is the handicap each yacht would need to have
been on for that race for them all to finish
equal on corrected time. For the next race the
new handicap is based on the BCH or BCR.
Actually we average the last four BCHs or BCRs
to take some of the volatility out of it. There
are also provisions to ignore a result that is
totally wayward. It would be great if some such
system could be built into Sailwave.

Albert Reynolds
Brisbane

------------------------------------

-!- http://www.yachtsandyachting.com/ -!- http://www.sailing.org/ -!- http://www.sailwave.com/ -!- On-Line Sailwave help...http://sailwave.com/help/HTML ~ Mark Townsend's Sailwave User Guide is available from http://www.abyc.org/upload/Sailwave_ABYC_User_Guide.pdf ~ Convert to daily digest of emails send blank email to sailwave-digest@yahoogroups.com ~ To unsubscribe from the SUG please send blank email to sailwave-unsubscribe@yahoogroups.com Yahoo! Groups Links

11

Hi Art

         So you belive the middle boat in the results should have a BCR of it's RYA handicap and all the others should be adjusted relative to that? That should not be to difficult to do, I'll take a look and see if I cab get that done. If I can I'll send you a copy. Hopefully tomorrow or Wed.

cheers
Tony

···

At 20:04 20/02/2012, Art Engel wrote:

Tony,

I would also be interested as we do this now with another program
(custom) and are investigating moving to Sailwave. As Albert mentioned,
we think the middle boat (technically called the "median") is the best
way to go. We also are considering going back multiple races.

Perhaps this could be posted in the files section of the SUG. Otherwise,
I'd like a copy directly.

Presumably, this could be done easily in Excel but I haven't yet tried
to create a spreadsheet.

Art

PS - Sailwave can handle back correcting from the first or last boat
using either 0% or 100% in the input box. With anything else the
calculation seems to be messed up and there is no predicting which boat
it will use as the "base" boat.

On 2/20/2012 5:50 AM, Tony Tucker wrote:
> Hi Roger
>
> I have an application that can be used to publish
> from a Sailwave series that will generate a csv
> file containing the average BCR's.
>
> Let me know if you'd like a copy.
>
> cheers
> Tony
>
> At 13:24 20/02/2012, albert.reynolds70 wrote:
>>
>> --- In
>> <mailto:sailwave%40yahoogroups.com>sailwave@yahoogroups.com,
>> "Roger"<rogermbwilson@...> wrote:
>>>
>>> Hi,
>>> I am in the same boat. I need to work out how
>> to use sailwave to calculate personal handicaps
>> from the elapsed times, preferably using the
>> results of a whole series to produce average
>> handicapes. Has anyone got an idiot's guide?
>>>
>>> Roger Wilson
>>> Lymington
>>>
>> Hi Roger and All, I'm not sure sailwave can do
>> this efficiently at present. We use a system
>> which uses the mean result (the best measure of
>> central tendancy) as the comparative boat. Now
>> this boat is more than likely a fictitious boat
>> but it is the most accurate "standard" for the
>> fleet on the day. The BCH or BCR (same meaning)
>> is the handicap each yacht would need to have
>> been on for that race for them all to finish
>> equal on corrected time. For the next race the
>> new handicap is based on the BCH or BCR.
>> Actually we average the last four BCHs or BCRs
>> to take some of the volatility out of it. There
>> are also provisions to ignore a result that is
>> totally wayward. It would be great if some such
>> system could be built into Sailwave.
>>
>> Albert Reynolds
>> Brisbane
>>
>
> ------------------------------------
>
> -!- <http://www.yachtsandyachting.com/>http://www.yachtsandyachting.com/ -!- http://www.sailing.org/ -!- <http://www.sailwave.com/>http://www.sailwave.com/ -!- On-Line Sailwave <help...http://sailwave.com/help/HTML>help...http://sailwave.com/help/HTML ~ Mark Townsend's Sailwave User Guide is available from <http://www.abyc.org/upload/Sailwave_ABYC_User_Guide.pdf>http://www.abyc.org/upload/Sailwave_ABYC_User_Guide.pdf ~ Convert to daily digest of emails send blank email to <mailto:sailwave-digest%40yahoogroups.com>sailwave-digest@yahoogroups.com ~ To unsubscribe from the SUG please send blank email to <mailto:sailwave-unsubscribe%40yahoogroups.com>sailwave-unsubscribe@yahoogroups.com Yahoo! Groups Links
>

12

Suggest you contact Jon Eskdale, Colin Jenkins suggested I get in touch with him, he is assisting me to set up a personnel handicap system at the moment.

We have looked at Sail100 and Topyacht which do what we want but are too complicated to use when compared with Sailwave.

The system Jon has put together operates with Sailwave and looks like it will do the job for us.

Ken Durward

Clayton Bay Boat Club

South Australia

···

From my point of view, if successful, it will make the best system available (Sailwave) even better.

From: sailwave@yahoogroups.com [mailto:sailwave@yahoogroups.com] On Behalf Of Art Engel
Sent: Tuesday, 21 February 2012 6:35 AM
To: sailwave@yahoogroups.com
Subject: Re: [Sailwave] Re: BCR (personal handicaps)

Tony,

I would also be interested as we do this now with another program
(custom) and are investigating moving to Sailwave. As Albert mentioned,
we think the middle boat (technically called the “median”) is the best
way to go. We also are considering going back multiple races.

Perhaps this could be posted in the files section of the SUG. Otherwise,
I’d like a copy directly.

Presumably, this could be done easily in Excel but I haven’t yet tried
to create a spreadsheet.

Art

PS - Sailwave can handle back correcting from the first or last boat
using either 0% or 100% in the input box. With anything else the
calculation seems to be messed up and there is no predicting which boat
it will use as the “base” boat.

On 2/20/2012 5:50 AM, Tony Tucker wrote:

Hi Roger

I have an application that can be used to publish
from a Sailwave series that will generate a csv
file containing the average BCR’s.

Let me know if you’d like a copy.

cheers
Tony

At 13:24 20/02/2012, albert.reynolds70 wrote:

— In
mailto:sailwave%40yahoogroups.comsailwave@yahoogroups.com,
“Roger”<rogermbwilson@…> wrote:

Hi,
I am in the same boat. I need to work out how
to use sailwave to calculate personal handicaps
from the elapsed times, preferably using the
results of a whole series to produce average
handicapes. Has anyone got an idiot’s guide?

Roger Wilson
Lymington

Hi Roger and All, I’m not sure sailwave can do
this efficiently at present. We use a system
which uses the mean result (the best measure of
central tendancy) as the comparative boat. Now
this boat is more than likely a fictitious boat
but it is the most accurate “standard” for the
fleet on the day. The BCH or BCR (same meaning)
is the handicap each yacht would need to have
been on for that race for them all to finish
equal on corrected time. For the next race the
new handicap is based on the BCH or BCR.
Actually we average the last four BCHs or BCRs
to take some of the volatility out of it. There
are also provisions to ignore a result that is
totally wayward. It would be great if some such
system could be built into Sailwave.

Albert Reynolds
Brisbane

-!- http://www.yachtsandyachting.com/ -!- http://www.sailing.org/ -!- http://www.sailwave.com/ -!- On-Line Sailwave help…http://sailwave.com/help/HTML ~ Mark Townsend’s Sailwave User Guide is available from http://www.abyc.org/upload/Sailwave_ABYC_User_Guide.pdf ~ Convert to daily digest of emails send blank email to sailwave-digest@yahoogroups.com ~ To unsubscribe from the SUG please send blank email to sailwave-unsubscribe@yahoogroups.com Yahoo! Groups Links

13

Hi all,
I am still not used to these YAHOO groups - I hope my 'post' is done right...

I am interested a lot in these handicap adjustment tool/application Tony was talking about. I actually try to convince our club RO, that for leisure sailing it makes sense to have a boat/crew handicap system.

Greetings from Baltic Sea, Germany
Joerg

PS: If possible pls mail the application to Liese@trave-forum.de

···

--- In sailwave@yahoogroups.com, "Ken Durward" <kendurward@...> wrote:

Suggest you contact Jon Eskdale, Colin Jenkins suggested I get in touch with
him, he is assisting me to set up a personnel handicap system at the moment.

We have looked at Sail100 and Topyacht which do what we want but are too
complicated to use when compared with Sailwave.

The system Jon has put together operates with Sailwave and looks like it
will do the job for us.

From my point of view, if successful, it will make the best system available
(Sailwave) even better.

Ken Durward

Clayton Bay Boat Club

South Australia

From: sailwave@yahoogroups.com [mailto:sailwave@yahoogroups.com] On Behalf
Of Art Engel
Sent: Tuesday, 21 February 2012 6:35 AM
To: sailwave@yahoogroups.com
Subject: Re: [Sailwave] Re: BCR (personal handicaps)

Tony,

I would also be interested as we do this now with another program
(custom) and are investigating moving to Sailwave. As Albert mentioned,
we think the middle boat (technically called the "median") is the best
way to go. We also are considering going back multiple races.

Perhaps this could be posted in the files section of the SUG. Otherwise,
I'd like a copy directly.

Presumably, this could be done easily in Excel but I haven't yet tried
to create a spreadsheet.

Art

PS - Sailwave can handle back correcting from the first or last boat
using either 0% or 100% in the input box. With anything else the
calculation seems to be messed up and there is no predicting which boat
it will use as the "base" boat.

On 2/20/2012 5:50 AM, Tony Tucker wrote:
> Hi Roger
>
> I have an application that can be used to publish
> from a Sailwave series that will generate a csv
> file containing the average BCR's.
>
> Let me know if you'd like a copy.
>
> cheers
> Tony
>
>
>
> At 13:24 20/02/2012, albert.reynolds70 wrote:
>>
>>
>>
>>
>> --- In
>> <mailto:sailwave%40yahoogroups.com>sailwave@yahoogroups.com
<mailto:sailwave%40yahoogroups.com> ,
>> "Roger"<rogermbwilson@> wrote:
>>>
>>>
>>> Hi,
>>> I am in the same boat. I need to work out how
>> to use sailwave to calculate personal handicaps
>> from the elapsed times, preferably using the
>> results of a whole series to produce average
>> handicapes. Has anyone got an idiot's guide?
>>>
>>> Roger Wilson
>>> Lymington
>>>
>> Hi Roger and All, I'm not sure sailwave can do
>> this efficiently at present. We use a system
>> which uses the mean result (the best measure of
>> central tendancy) as the comparative boat. Now
>> this boat is more than likely a fictitious boat
>> but it is the most accurate "standard" for the
>> fleet on the day. The BCH or BCR (same meaning)
>> is the handicap each yacht would need to have
>> been on for that race for them all to finish
>> equal on corrected time. For the next race the
>> new handicap is based on the BCH or BCR.
>> Actually we average the last four BCHs or BCRs
>> to take some of the volatility out of it. There
>> are also provisions to ignore a result that is
>> totally wayward. It would be great if some such
>> system could be built into Sailwave.
>>
>> Albert Reynolds
>> Brisbane
>>
>>
>
>
>
> ------------------------------------
>
> -!- http://www.yachtsandyachting.com/ -!- http://www.sailing.org/ -!-
http://www.sailwave.com/ -!- On-Line Sailwave
help...http://sailwave.com/help/HTML ~ Mark Townsend's Sailwave User Guide
is available from http://www.abyc.org/upload/Sailwave_ABYC_User_Guide.pdf ~
Convert to daily digest of emails send blank email to
sailwave-digest@yahoogroups.com <mailto:sailwave-digest%40yahoogroups.com>
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sailwave-unsubscribe@yahoogroups.com
<mailto:sailwave-unsubscribe%40yahoogroups.com> Yahoo! Groups Links
>
>
>
>

14

Hi All, Mention has been made of using “median” as the standard boat. Suggest one should think about using “mean”. In strung out fleets the median can be quite different from the mean. The mean is the average and almost always a calculated imaginary boat. Also suppose only 2 boats finish - there is no median

but there will be a mean.

Cheers

Albert

···

From: liese2007 roaringforties@web.de
To: sailwave@yahoogroups.com
Sent: Wednesday, 22 February 2012 6:10 AM
Subject: [sailwave] Re: BCR (personal handicaps)

Hi all,
I am still not used to these YAHOO groups - I hope my ‘post’ is done right…

I am interested a lot in these handicap adjustment tool/application Tony was talking about. I actually try to convince our club RO, that for leisure sailing it makes sense to have a boat/crew handicap system.

Greetings from Baltic Sea, Germany
Joerg

PS: If possible pls mail the application to Liese@trave-forum.de

— In sailwave@yahoogroups.com, “Ken Durward” <kendurward@…> wrote:

Suggest you contact Jon Eskdale, Colin Jenkins suggested I get in touch with
him, he is assisting me to set up a personnel handicap system at the moment.

We have looked at Sail100 and Topyacht which do what we want but are too
complicated to use when compared with Sailwave.

The system Jon has put together operates with Sailwave and looks like it
will do the job for us.

From my point of view, if successful, it will make the best system available
(Sailwave) even better.

Ken Durward

Clayton Bay Boat Club

South Australia

From: sailwave@yahoogroups.com [mailto:sailwave@yahoogroups.com] On Behalf
Of Art Engel
Sent: Tuesday, 21 February 2012 6:35 AM

To: sailwave@yahoogroups.com

Subject: Re: [Sailwave] Re: BCR (personal handicaps)

Tony,

I would also be interested as we do this now with another program
(custom) and are investigating moving to Sailwave. As Albert mentioned,
we think the middle boat (technically called the “median”) is the best
way to go. We also are considering going back multiple races.

Perhaps this could be posted in the files section of the SUG. Otherwise,
I’d like a copy directly.

Presumably, this could be done easily in Excel but I haven’t yet tried
to create a spreadsheet.

Art

PS - Sailwave can handle back correcting from the first or last boat
using either 0% or
100% in the input box. With anything else the
calculation seems to be messed up and there is no predicting which boat
it will use as the “base” boat.

On 2/20/2012 5:50 AM, Tony Tucker wrote:

Hi Roger

I have an application that can be used to publish
from a Sailwave series that will generate a csv
file containing the average BCR’s.

Let me know if you’d like a copy.

cheers
Tony

At 13:24 20/02/2012, albert.reynolds70 wrote:

— In
mailto:sailwave%40yahoogroups.comsailwave@yahoogroups.com

mailto:sailwave%40yahoogroups.com ,

“Roger”<rogermbwilson@> wrote:

Hi,
I am in the same boat. I need to work out how
to use sailwave to calculate personal handicaps
from the elapsed times, preferably using the
results of a whole series to produce average
handicapes. Has anyone got an idiot’s guide?

Roger Wilson
Lymington

Hi Roger and All, I’m not sure sailwave can do
this efficiently at present. We use a system
which uses the mean result (the best measure of
central tendancy) as the comparative boat. Now
this boat is more than likely a fictitious boat
but it is the most accurate “standard”
for the

fleet on the day. The BCH or BCR (same meaning)
is the handicap each yacht would need to have
been on for that race for them all to finish
equal on corrected time. For the next race the
new handicap is based on the BCH or BCR.
Actually we average the last four BCHs or BCRs
to take some of the volatility out of it. There
are also provisions to ignore a result that is
totally wayward. It would be great if some such
system could be built into Sailwave.

Albert Reynolds
Brisbane

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15

In statistics, the "median" is defined to be the center datum when there are an odd number of data and the mean (i.e., average) of the two center data when there are an even number of data. Excel follows that definition and I believe other programs, such as databases like Access, pretty much do as well. [There is variation among software programs about how to round number but not, to my knowledge, about how to calculate "median."]

In the context of a "standard" boat, I think median would probably be a better choice than mean (i.e., average). It frequently occurs that someone got different wind and might be WAY ahead or messed up crew work and might be WAY begin. Those kind of outliers might skew the mean but won't impact calculation of the median.

Art

···

On 2/23/2012 9:04 PM, Albert Reynolds wrote:

Hi All, Mention has been made of using "median" as the standard boat. Suggest one should think about using "mean". In strung out fleets the median can be quite different from the mean. The mean is the average and almost always a calculated imaginary boat. Also suppose only 2 boats finish - there is no median

  but there will be a mean.

Cheers
Albert

________________________________
From: liese2007<roaringforties@web.de>
To: sailwave@yahoogroups.com
Sent: Wednesday, 22 February 2012 6:10 AM
Subject: [sailwave] Re: BCR (personal handicaps)

Hi all,
I am still not used to these YAHOO groups - I hope my 'post' is done right...

I am interested a lot in these handicap adjustment tool/application Tony was talking about. I actually try to convince our club RO, that for leisure sailing it makes sense to have a boat/crew handicap system.

Greetings from Baltic Sea, Germany
Joerg

PS: If possible pls mail the application to Liese@trave-forum.de

--- In sailwave@yahoogroups.com, "Ken Durward"<kendurward@...> wrote:

Suggest you contact Jon Eskdale, Colin Jenkins suggested I get in touch with
him, he is assisting me to set up a personnel handicap system at the moment.

We have looked at Sail100 and Topyacht which do what we want but are too
complicated to use when compared with Sailwave.

The system Jon has put together operates with Sailwave and looks like it
will do the job for us.

From my point of view, if successful, it will make the best system available
(Sailwave) even better.

Ken Durward

Clayton Bay Boat Club

South Australia

From: sailwave@yahoogroups.com [mailto:sailwave@yahoogroups.com] On Behalf
Of Art Engel
Sent: Tuesday, 21 February 2012 6:35 AM
To: sailwave@yahoogroups.com
Subject: Re: [Sailwave] Re: BCR (personal handicaps)

Tony,

I would also be interested as we do this now with another program
(custom) and are investigating moving to Sailwave. As Albert mentioned,
we think the middle boat (technically called the "median") is the best
way to go. We also are considering going back multiple races.

Perhaps this could be posted in the files section of the SUG. Otherwise,
I'd like a copy directly.

Presumably, this could be done easily in Excel but I haven't yet tried
to create a spreadsheet.

Art

PS - Sailwave can handle back correcting from the first or last boat
using either 0% or 100% in the input box. With anything else the
calculation seems to be messed up and there is no predicting which boat
it will use as the "base" boat.

On 2/20/2012 5:50 AM, Tony Tucker wrote:

Hi Roger

I have an application that can be used to publish
from a Sailwave series that will generate a csv
file containing the average BCR's.

Let me know if you'd like a copy.

cheers
Tony

At 13:24 20/02/2012, albert.reynolds70 wrote:

--- In
<mailto:sailwave%40yahoogroups.com>sailwave@yahoogroups.com

<mailto:sailwave%40yahoogroups.com> ,

"Roger"<rogermbwilson@> wrote:

Hi,
I am in the same boat. I need to work out how

to use sailwave to calculate personal handicaps
from the elapsed times, preferably using the
results of a whole series to produce average
handicapes. Has anyone got an idiot's guide?

Roger Wilson
Lymington

Hi Roger and All, I'm not sure sailwave can do
this efficiently at present. We use a system
which uses the mean result (the best measure of
central tendancy) as the comparative boat. Now
this boat is more than likely a fictitious boat
but it is the most accurate "standard" for the
fleet on the day. The BCH or BCR (same meaning)
is the handicap each yacht would need to have
been on for that race for them all to finish
equal on corrected time. For the next race the
new handicap is based on the BCH or BCR.
Actually we average the last four BCHs or BCRs
to take some of the volatility out of it. There
are also provisions to ignore a result that is
totally wayward. It would be great if some such
system could be built into Sailwave.

Albert Reynolds
Brisbane