The factors you have listed are fairly basic, and would be reflected in the morning line(sometimes).
Any time there's a hot jockey/trainer combo, or "jockey on for this trainer really trying" it's well known.
Many handicappers look at jockey strengths and weaknesses, but that's also reflected to a lesser degree in Bris and DRF stats - again, commonly known.
Many handicappers look at trainer patterns, which are usually only presented in high-level numbers, but more advanced tools like Formulator let you drill down deeper, and get specific stats for a particular race/horse/setup. Less commonly known, especially those for rounding out the exotics vs. winning.
Some connections "point" to the boutique meets like Saratoga, Keeneland and Del Mar, while others avoid those or do poorly, saving their ammo for easier pickings.
There is good reason to review meet statistics, mostly on the wagering side, which eliminates many of them for me. But some venues that race year round or for many months would require separating their "meets" up to get any more useful data.
Meanwhile, I'll be bold and say that kind of homework can be more usefully spent taking extensive trip notes and using physical appearance - which are not as commonly used, and vary wildly between 'cappers.
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