APBRmetrics

Thanks JE, that explanation makes a lot of sense, especially about the squared sum penalty being unweighted. In that case I suppose I'll just continue force-centering my RAPM post-processing.

When you do a weighted average of JE's by possessions it averages to 0. I can't figure out why this is and would love any insights. If anyone has any insights on the differences i'd love to hear them I simply force it to be this way, ie I compute the possession weighed average and then subtract tha...

He's tweeted about the supposed impending doom of nba_api a couple times, most recently https://x.com/NBACouchside/status/1781364508801298749 . He seems somewhat connected in the analytics community, so I can't dismiss his claim out of hand. I know some forum users here have extensive experience in ...

I'm happy to say I finally figured out the issue. It was this little function: def lambda_to_alpha(lambda_value, samples): return (lambda_value * samples) / 2.0 You were right that converting lambdas to alphas in this way is unnecessary, and moreover it just decreases the regularization parameter wh...

Thanks for the reply JE. Wouldn't the intercept be interpreted as the expected pts/poss of a lineup of five players with 0 O-RAPM vs five players with 0 D-RAPM? Is that the wrong interpretation? The point about the intercept being subjected to lambda is interesting... maybe that's why the intercept ...

Hi, this is my first time posting here. Please let me know if this is not the place to post questions like this. I've just been tinkering around with generating some RAPM numbers using Ryan Davis's python code https://github.com/rd11490/NBA_Tutorials/blob/master/rapm/rapm.py (relatedly, is this code...