golden wrote:
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https://fansided.com/2017/01/12/nylo...trics-actions/
The idea of how best to defend a 3-pointer has become pretty solid — don’t let your opponents shoot them. This is not a new concept — we know that there is a lot of randomness in defensive 3-point percentage and that the best defenses generally limit attempts.
On 3-pointers, there is essentially no year-to-year correlation for either the Defended FG% stat or the Difference stat. This means that a defender doesn’t really have the ability to control their Defended FG%. This is not to say that on any one particular shot attempt a defender couldn’t make the shot attempt more difficult and force a miss. It simply means that as the sample size gets larger, more randomness seeps into this particular metric, making it essentially unusable as a measure of individual defense.
Outside of six feet, everything appears to be mostly random — defenders don’t appear to have any control over their Defended FG%.
Another point is that a defender can deter the shot by making sure the shooter isn’t comfortable shooting. As Johannes Becker explained here, NBA players have a comfort zone and will shoot if they feel comfortable with the amount of space they have to get the shot off. So as a defender, you have to attempt to crowd their space and make them feel uncomfortable about shooting. In that article, Johannes also found that a players’ comfort zone requires more space (defender distance between the shooter and defender) when there is a negative height differential (meaning the defender is taller than the shooter).
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