Thanks Luckyboy and all contributors.
The above is more along the lines of what I was searching for.

I know it can be done mechanically because WA Tabform do it with a computer and are accurate enough for me.

I just wanted to know if anyone found a combination of two or three factors which resulted in at least 70% of the horses becoming favourite on the tote.

The false favourite is a little different argument.

Thanks guys.