partypooper,

I can't help you with WA Zipform, but here are a few facts from my Zipform monitoring over the past three years:

1. The top rated (not equal) Zipform horse has a strike rate of 21%;
2. The strike rate improves with horses having a 57 or greater Zipform rating;
3. The ratings are more reliable when the Zipform spread is greater than 7 (i.e. top rated 57, bottom rated 49);
4. 79% of all winners are rated within four points of the top rated horse;
5. Generally four points covers the top 6 rated horses.

These statistics are for S/M/B/A Saturday races not including 2YO, Hurdles, Steeples or Adelaide races below Class 6.

I’m a bit of Zipform fan, but do not use it in isolation. Typically, it is heavily weighted to a horse's last start (see Confectioner's rating for last Saturday) and does not account for barrier or jockey ability.


Cheers,
Luckyboy