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Wednesday, August 20, 2003

The meaning of statistics 


Nick thinks that the Red Sox's paltry record in games in which they score 4 or fewer runs means they can't win "when the heat is on". The link he provides gives us his chart:

Record In Games Where Scoring 4 Runs or Less
Wins Losses Percentage
Oak 25 41 .379
Sea 21 40 .344
NYY 13 38 .255
Bos 9 35 .205

Let me add these numbers from some bad American League teams:

Wins Losses Percentage
Oak 25 41 .379
Sea 21 40 .344
Cle 22 61 .265
NYY 13 38 .255
TB 18 52 .247
Bos 9 35 .205
Det 13 78 .143
Tex 5 48 .094

Wow, Boston is behind Tampa Bay. But what's Cleveland doing ahead of New York? Surely it can't mean that they're better than the Yankees under pressure?

Let me further add to the chart the rank among these teams in runs scored and earned run average:

Wins Losses Percentage Offense ERA
Oak 25 41 .379 5 1
Sea 21 40 .344 4 2
Cle 22 61 .265 7 4
NYY 13 38 .255 2 3
TB 18 52 .247 6 6
Bos 9 35 .205 1 5
Det 13 78 .143 8 7
Tex 5 48 .094 3 8

As you can see, the record of a team when scoring four runs or fewer correlates almost perfectly to the quality of a team's pitching. As you go down the chart, the team's ERA gets worse. The conclusion to be drawn: a team's record when it scores four runs or fewer is an indication of the quality of the pitching, not the team's ability to perform under pressure.
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