I handicap trainers using meet-specific stats. For example, A trainer could hit 6% nationwide on turf, but if they hit 25% on turf at Tampa, that’s when I jump in.
I also exclude horses in that manner. For example, for years Bruce Levine would hit 25% combined at all NYRA tracks, but only like 4% at Saratoga. Would help me toss his faves at Saratoga.
That’s just a general overview. I look at more specific scenarios such as class level moves, surface switches, layoffs, etc.
Started this years ago when I found Jim Mazur’s Progressive Handicappping books. Have continued on with it since he discontinued Tampa.