New PY Website

Originally posted by craiggo So for those interested in the suggested changes for a tidal estuary, here are my clubs latest figures from PYS.

Looking at those figues, particularly the Scorpion, you seem to have a serious problem.
You have significant data, yet you are suggesting a PY 8% different from what you are using?
That is an immense difference, how do expect people to take your racing seriously if you spread the word that the py's are that badly wrong?

I suspect you have some good sailors sailing Scorpions?

as promised a couple of pages back, list of changes for classes throughout the season.

Chaps, you may not know it, but in this discussion you are getting deep into statistical theory - far deeper than I for one have the mathematics to safely go and also far deeper than you actually have enough information to usefully discuss the topic.

As a rule of thumb more data normally beats selected data in statistical analysis unless you know *exactly* what you are doing, so my money is that what Draycote are doing will produce more accurate PY numbers than they were getting before.

If you want to contest this it ought to be straightforward enough as the sets of data are reasonably identifiable. What you need to do is get all the data, which I imagine is published on their website, separate the two bodies, that of times extracted from class races and times extracted from handicap races, and run a series of comparisons to see if the variations between them are statistically valid.

I have no intention of doing the research it would take *me* as a very amateur statistician even to work out how to do the analysis but it would probably be on the lines of starting with standard deviation and variance and going from there. Without doing this, well, I suppose internet forums are just pub chat...

Apologies for the misappropriation.