Sports on Paper Canzhi Ye

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

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

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

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

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

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/