Barny just to get a new thread going not in relation to laying have you run since 1999 all metro races and the results if one were to back every horse.

From here we could individually test certain filters to be under or over bet by the public pending a constant strike rate
Also the years of change over time.

I got a LOT of about 21.6% on Saturday metro. Seems to high.

Vortech, yes I've done exactly what you've posted. YKW will jump all over this, so sorry I just dont want to go there.

Vortech, not too high. That's roughly what I get also.
One area you may like to consider is not just the filters, but the betting trends.
Filters can also be overbet and underbet depending on whether as a whole the horse was a firmer or a drifter in betting.
This is the catch when trying to identify filters under or overbet.

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Could you use Prepost and Starting Price to define a firmer or drifter.
Probably not as the Market % is different.