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Friday, October 19, 2012

Cano's Freaky Hot and Cold Streaks

Robinson Cano went 3-for 40 in the postseason; that works out to a batting average of .075. .075! What are the odds of a good hitter like Cano having such a cold streak?

The binomial distribution indicates the probability of Cano going 3-40 (or worse) is 0.00048 - approximately 2084-1 odds.

But that is not the most improbable streak Cano was on in the last month. What I mean is that Cano closed the regular season by going 24-39; that works out to a .615 batting average.

The probability of going 24-39 (or better) is 0.00006 - approximately 16558-1 odds.

In terms of explaining how this could happen, "That's baseball Susan" is all that comes to mind.

To confirm how rare both of these streaks are, I checked my play-by-play database (which goes thru 2011). According to that:

  • Cano had never gone 24-39. The best batting average Cano had ever had in 39 ABs was .538 - 21 hits.
  • Cano had never gone 3-40. The worst batting average Cano had ever had in 40 ABs was .100- 4 hits.
So, to summarize, Cano closed out the regular season with a hot streak that has a 1 out of 16558 chance of occurring. He then immediately went on a cold streak that has a 1 out of 2084 chance of occurring.

That's baseball Susan.

Of course, like most stats involving hot and cold streaks, it depends upon how you slice them up. If you combine these 2 streaks, Cano has gone 27-79 since September 25, for a .342 batting average. The odds of Cano hitting .342 or better for 79 ABs are a mere 1 out of 3.6.

Finally, this perhaps does not need stating, but the emotional state of some observers makes me feel it necessary to clarify: the fact that Cano was hot in the end of the regular season and cold in the playoffs does not suggest Cano is a choker. Apart from these being small sample sizes, remember that those regular-season games were crucial - if Cano had played poorly, the Yankees might not have won the division and thus may never have advanced to the ALCS.

Technical note: I used .305 as the probability of Cano getting a hit in a given at-bat, because his career average is .305 including both the regular- and post-season.

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