I was joined by Kostya Medvedovsky, the creator of the basketball projection system DARKO. We went into the weeds about the methodology behind DARKO and answered questions from Twitter about it. We then picked Kostya's brain on a wide range of NBA analytics ideas, mostly focused on topics that involve predicting things. Finally, we answered some more questions from Twitter. You can find Kostya on twitter: @kmedved

[00:00:00] - DARKO
[00:05:05] - exponential decay
[00:08:10] - kalman filters
[00:11:10] - gradient boosted trees go brrrr?
[00:13:40] - data infra
[00:21:30] - seasonality effects
[00:30:45] - rule changes, big external shifts like COVID
[00:37:50] - aging effects
[00:42:40] - measuring defense with box score data
[00:44:50] - Canzhi rants on RAPM, SPM
[00:52:35] - garbage time
[00:57:00] - how to structure data, wax poetic on pbpstats
[01:02:20] - player career and longevity projections
[01:09:30] - another GBT package
[01:10:50] - DFS, betting
[01:19:40] - when DARKO struggles / can learn from betting markets
[01:26:55] - college basketball DARKO
[01:35:00] - NBA preseason
[01:41:30] - coach RAPM lol
[01:43:10] - playoff adjustments
[01:46:25] - playoff adjustments
[01:49:05] - hot hand (fallacy? paper linked below), midwits
[01:55:40] - Sengun
[02:00:50] - team building, quantifying lineup ~synergies~


Things we brought up in the episode:
DARKO: https://darko.app
DRIP: https://theanalyst.com/na/2021/10/nba-stats-and-player-projections/
Hot hand discussion: https://marketing.wharton.upenn.edu/wp-content/uploads/2018/11/Paper-Joshua-Miller.pdf

8 - Kostya Medvedovsky, DARKO and assorted NBA analytics topics

I was joined by Udit Ranasaria who was part of a team that worked on the Passing Value in Expectation project for the Big Data Bowl. They went deep into the tracking data and built physics-based models for ball and player trajectory to estimate passing value, for all possible passes - not just the ones that happened. We also opined on the state of public tracking data based sports analytics, and Udit touched on some exciting new projects in the works. You can find him on twitter @uditranasaria

Project: https://www.kaggle.com/dutta64/pave-the-way-for-nfl-passing-analytics

7 - Udit Ranasaria, Passing Value in Expectation

In this episode, I was joined by the winners of the Big Data Bowl 2021, although we recorded this well before the results were announced. We talked about their project called Weighted Assessment of Defender Effectiveness which uses tracking data to allocate credit to individual defenders in coverage on pass plays. We touch on what it was like to work on a data project with others virtually during a pandemic before going deep on methods for defensive target probability over expectation (dTPOE) and defensive catch probability over expectation (dCPOE), and ideas for credit allocation. 
Their write up is here: https://www.kaggle.com/asmaetoumi/weighted-assessment-of-defender-effectiveness
You can find the guests on twitter!

 Tony ElHabr: @TonyElHabr
 Marschall Furman: @mlfurman3
  Asmae Toumi: @asmae_toumi
  Sydney Robinson: @syd_rob25

6 - Asmae Toumi, Tony ElHabr, Marschall Furman, and Sydney Robinson, Weighted Assessment of Defender Effectiveness (Big Data Bowl WINNERS!)

I was joined by Alex Stern, a current data science master's student and football analytics researcher at the University of Virginia. We talk about his Big Data Bowl project that goes to beyond the box score to quantify the value of defensive backs. The work extends upon the winning Big Data Bowl project from last year to include some cool Bayesian hierarchical models.

The project: https://www.kaggle.com/acs4wq/algorithms-in-the-war-room

5 - Alex Stern, Algorithms in the War Room

I was joined by Charlie Gelman, a recent computer science and stats graduate from Duke.  We talk about his Big Data Bowl project about defensive backs playing in press man coverage. Bonus segment at the end about wrestling analytics.
0:24 Intro, background
4:00 Paper 
54:00 Wrestling analytics
The project: https://www.kaggle.com/charlesgelman/hip-reaction-drill

4 - Charlie Gelman, Hip Reaction Time (Big Data Bowl), wrestling analytics

I was joined by Dani Chu, a graduate student in statistics at Simon Fraser University and part of the team that won the NFL's inaugural Big Data Bowl. We talk about his fascinating research done on NFL tracking data to identify routes. We also speculate and think wishfully about the metrics that could be developed if the tracking data were to ever become public.
The paper: https://arxiv.org/abs/1908.02423
The Josh Hermsmeyer article we mentioned: https://fivethirtyeight.com/features/can-nfl-coaches-overuse-play-action-they-havent-yet/

3 - Dani Chu, NFL Route Identification

My guest today is Kanaad. He is a friend of mine from Berkeley, and he is a Cavs and RL enthusiast.  We talk about a fascinating paper from the 2018 Sloan Sports Analytics Conference. The main idea is that by modeling each possession as a Markov Decision Process, it becomes easy to build a simulator that can help us answer questions like "How much more efficient would a team be if they took 20% fewer midrange shots early in the shot clock?" 

The paper: http://www.lukebornn.com/papers/sandholtz_ssac_2018.pdf

2 - Kanaad Parvate, NBA shot policies, MDPs, Reinforcement Learning, etc

A discussion with Twitter friend Ryan Davis (@rd11490) of a seminal paper in the field of NBA analytics, "Improved NBA Adjusted +/- Using Regularization and Out-of-Sample Testing." Afterwards, we share ideas on ways to further improve RAPM.
(00:00) paper discussion
(29:00) additional topics on player evaluation with RAPM framework

Paper: http://www.sloansportsconference.com/wp-content/uploads/2015/09/joeSillSloanSportsPaperWithLogo.pdf
RAPM tutorial: https://twitter.com/rd11490/status/1128782945630740483

1 - Ryan Davis, Adjusted Plus-Minus and Friends

Introducing the Sports on Paper podcast, hosted by Canzhi Ye.
First real episode coming soon...
Follow the pod on twitter @sportsonpaper!

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