New PY Website

Hi Moomin,
I’m not sure that I can answer your question but I’ll give myself as an example. All the single boat classes in our club still currently have a 0 c.f. I think your assumption of a single boat sailed in consistent way is wrong as even if you win every race your position from the mean could vary drastically and then your sailed to PY will be different. Have a look at my 100 PY below, it’s all over the place (and I would hope I sail consistently bad ):



When you have lots of boats it takes the average of their sailed to PY and as you can see on our 400’s the graph the range is smaller thus giving us a good c.f.

Hadn't noticed that but......... there is a reason for that!

moomin

The PYS confidence factor is a composite metric based on

• number of samples
• number of different competitors in sample
• variation in sample over time

The PYS cannot take account of CSF for a club fleet - however if you have a fleet with a range of skill levels then the PYS number for your boat should be a pretty good measure of a local PY.  If it is for a single boat then less so - and you need to think about the implications for any local adjustment (perhaps considering results obtained for you class at similar clubs - you'll need to consider what 'similar' means (classes sailed, water conditions etc.).  However for a class with a single competitor the cf should never get particularly big - only one competitor and surprisingly I would guess that like most competitors your actual PN varies in a range of 50-100 points across a season so that variation over time will be high (= lower cf).

At my club we take the PYS output as a starting point for the local adjustments and then do some analysis of individual data points across multiple seasons to analyse relative CSF values between our main fleets (remarkably similar with the exception of one fleet).  As several others have noted the introduction of local adjustments has resulted in more competitive racing and a greater mix in the results at my club - this may be one factor in higher turnouts.

Remember this is the first year that the PYS has tried the cf - it is very likely to be tweaked and improved as more experience is gained.

mark


Edited by marke - 14 Nov 12 at 11:19am

Thanks Marke and Alex,

Originally posted by JimC Amused to note that using the old spreadsheet system this season our Laser Radial fleet checked out faster on the water than the full rig boats. There of course is the big challenge for handicapping at a club level.

Has it been a windy year? Or are the radial sailors the hotshots and the full rig the normal club sailors?