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Originally Posted by Cratos
It is not just post position; it is post position with respect to turn length (radius). For instance at Saratoga the turn length is 1476 feet, at Belmont it is over 2,000 feet and at Churchill Downs it is 1,296 feet.
Why do these numbers matter? It is because the race starting positions relative to the turn is different given the same race distance and this affects the post position impact value.
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Well, its a factor to consider just like anything else. Perhaps its significant and perhaps it isn't. It depends on the race and the numbers.
Based on the formula RXB presented the Rail has an IV = 1.41 but Posts 2 & 3 actually only have an IV = 1.02. With a decent sample size of 124 races I would think that could be a fairly significant difference. The original weight of 1.15 was obviously slanted because of the impact of the Rail.
