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NBA players more likely to miss free throws after non-shooting fouls

I’m working on a post for later in the day, and I found this interesting. Huge thanks to Scott Sereday of Basketball-Analysis.com for providing the data I analyzed.

Here are the NBA-wide expected and actual free-throw percentages between the 2005-06 and 2009-10 seasons  based on the type of foul that preceded the attempts. The expected value is determined by using a weighted average free-throw percentage (because different players are sent to the line by shooting fouls than are sent to the line by non-shooting fouls).

Foul type Expected Actual Difference
Shooting 75.06695863 75.30364372 0.236685095
Non-shooting 77.26086224 76.56608703 -0.694775207

I think the expected free-throw percentage after non-shooting fouls is so much higher than after shooting fouls  because teams intentionally foul late in games. This indicates leading teams are better at getting the ball into the hands of quality free-throw shooters than opposing teams are at forcing it into the hands of poor free-throw shooters. Considering the leading team can put quality free-throw shooters on the court and poor free-throw shooters on the bench, this makes sense.

If that largely explains the difference in expected free-throw percentage based on foul type, that means players shoot a disproportionate number of free throws after non-shooting fouls late in games – when players are tired and likely to struggle at the line. That would explain why the actual percentage after non-shooting fouls falls short of the expect percentage.

I have one other theory: players might benefit from being in a rhythm after a shot. Players often shoot for no reason after a referee blows his whistle, but that practice could benefit the players who do that. If I were a player and drew a non-shooting foul that would send me to the free-throw line, I’d shoot the ball instead of handing it directly to the referee when possible. Better safe than sorry.

5 Comments

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  • Feb 2, 201112:52 am
    by Devon

    Reply

    Late game non-shooting fouls that lead to free-throws also tend to be pressure packed.  Have to believe that most players tend to perform worse under pressure (of course there are many exceptions).  But it is tough to make free throws when the game is on the line.

    • Feb 3, 20119:33 pm
      by Dan Feldman

      Reply

      Devon, I think that’s a small factor, but by the time most players reach the NBA, the pressure doesn’t faze them.

  • Feb 2, 20113:21 am
    by Bryan

    Reply

    These differences between the actual FT% and estimated FT% are very small (<1%).  Are you sure that these differences are statistically significant?

    • Feb 3, 20119:36 pm
      by Dan Feldman

      Reply

      Bryan, I think they’re a big deal. A change of .7 percentage points represents a swing of about five spots in the team rankings.

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