1) All the angle data is the absolute value now. The higher the number, the more pull-happy, so handedness is irrelevant.

2) Interesting point, I’m not sure at which point of a ball’s flight the angle is taken from.

3) Yeah, I questioned why the distance coefficient was negative as well. ]]>

1). are you accounting for batter handedness when you are looking at batted ball angle because and angle that would represent a pulled ball by a right handed hitter would be and opposite field ball by a left handed hitter, so if you are ignoring handedness off the hitter the batted ball angle becomes almost useless.

2.) my understanding a of the batted ball angle data is that it is based on where the ball lands not the actual angle it was hit at, this is a fairly good approximation for batted ball angle except for the fact that batted balls tend to hook towards the foul pools making further hit pull or opposite field balls look like they were hit at a more extreme angle then they acutely were.

3.) this is more of a suggestion to help avoid over fitting, throw out terms that don’t really mean anything or that you don’t have a hypothesis to back up there existence. the first term that i would eliminate is angle^2 because there really is not such thing a as and angle squared, and it is also dependent on how you define your angle. Also i would get rid of any term related to distance that has a negative coefficient because hitting a ball a shorter distance should not increase hr/fb%.

4) you also might want to look at distance as a function of angle. players in general tend to pull most of there home runs but hit the majority of there fly balls to the opposite field, so a 1ft increase in opp field distance will increase average distance more than a 1ft increase in pull distance but the increase in pull distance increase home runs by more because the pulled balls are closer to the fence on average so they should benefit more from an extra foot.

5) also looking at fb% or batted ball frequency as a function of angle could also be informative. ]]>

Bat speed is not measured by anyone in a game situation. It has been measured in specialized experiments, using high-speed motion analysis and/or video. And there is quite clearly a very strong correlation between batted ball speed and bat speed.

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