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SeguimosAvanzando's avatar

Hi Neil,

First of all, I want to say that your work has been outstanding. While experimenting with ELO probabilities, I came across your predictions, and I wanted to ask for some clarification.

How do you calculate win probabilities for each match? Is it based on ELO rankings? I tried to calculate it using the following simple formula, taking Cowboys vs. Steelers as an example:

Visitors (Cowboys) = 1 / (1 + 10^((Local ELO 1571 - Visitor ELO 1554) / 400)) = 47.56%

Local (Steelers) = 1 / (1 + 10^((Visitor ELO 1554 - Local ELO 1571) / 400)) = 52.44%

As you can see, there is a significant difference compared to your win probability prediction, which is:

Cowboys 39%

Steelers 61%

This is a big huge difference, as I’ve been using the ELO method to beat sportsbooks, and while it has been successful so far, it has also been quite slow.

Regards

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Bennett Herbert's avatar

It looks like one of the biggest discrepancies is the Jets, whom you have as a bottom 10 team and a double-digit underdog week 1, vs. Vegas has them as a top 10-12 team and only a 4.5 underdog week 1. Are ELO ratings not accounting for Rodgers being back, and/or lower on the defense? Maybe worth mentioning a lot of people have said they believe the Jets defense stopped playing at its highest level last year after they were eliminated from playoff contention and had the worst offense in the league week in and week out.

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