I really don't know anything about Pit Rho or how sophisticated or rigorous their model may be. They came out with these multi-colored probability charts last year for the chase, and NBCSN.com did a short article each week. It is an interesting way to summarize how the probabilities cascade downwards for each elimination round.
Pit Rho has a web site for fantasy players (
https://fantasy.pitrho.com ). I have no interest in fantasy sports, but I signed up for the free service level, which shows their probabilities to win each week. I get the impression the weekly model is influenced by: type of track or maybe the specific track for this week or maybe both; how the car has performed in general over the last one or two years; and weekly qualifying results have a substantial impact.
Obviously, there must be a random element as well, and I know that Pit Rho has analyzed randomness on a per track basis.
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The bottom line is they rate Harvick the favorite almost every week, Kyle Busch second, and a big drop in probabilities after that. My gut says these two are over-valued by the model. But maybe that is my bias showing through, as those two are the drivers I dislike the most..
So I don't vouch for Pit Rho, and for Nascar quant, I prefer David Smith of Motorsports Analytics (but he also does not reveal his proprietary model parameters).