That's the value I would get. It's the standard statistical way for comparing different sets of results by converting one set of values to the same mean and standard deviation as the other set. It could be done in reverse and place% converted to an equivalent win%. I just think this is a good basic rating method.

Mind you I have tried this is practice but did not give it a fair trial. Previously I used place% only and in my trial I was not doing too well and then too rub insult ino my wounds in an a MR race the third place% horse won at $27 and I missed it. I then reverted to my place% approach. This was fortunate because in the very next MR race third place% won and paid $73 and I collected and did not give the standardised approach any more consideration. But of course place% by itself has its problems, more so these days as there are not too may good priced winners.