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Journal of Quantitative Analysis in Sports

An official journal of the American Statistical Association

Editor-in-Chief: Mark Glickman PhD

4 Issues per year


SCImago Journal Rank (SJR) 2015: 0.288
Source Normalized Impact per Paper (SNIP) 2015: 0.358
Impact per Publication (IPP) 2015: 0.250

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ISSN
1559-0410
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Estimating player contribution in hockey with regularized logistic regression

Robert B. Gramacy
  • Booth School of Business, The University of Chicago, 5807 S Woodlawn Ave, Chicago, IL 60637, USA
  • :
/ Shane T. Jensen
  • The Wharton School, University of Pennsylvania 3730 Walnut St., Philadelphia, PA 19102, USA
/ Matt Taddy
  • Booth School of Business, The University of Chicago, 5807 S Woodlawn Ave, Chicago, IL 60637, USA
Published Online: 2013-03-30 | DOI: https://doi.org/10.1515/jqas-2012-0001

Abstract

We present a regularized logistic regression model for evaluating player contributions in hockey. The traditional metric for this purpose is the plus-minus statistic, which allocates a single unit of credit (for or against) to each player on the ice for a goal. However, plus-minus scores measure only the marginal effect of players, do not account for sample size, and provide a very noisy estimate of performance. We investigate a related regression problem: what does each player on the ice contribute, beyond aggregate team performance and other factors, to the odds that a given goal was scored by their team? Due to the large-p (number of players) and imbalanced design setting of hockey analysis, a major part of our contribution is a careful treatment of prior shrinkage in model estimation. We showcase two recently developed techniques – for posterior maximization or simulation – that make such analysis feasible. Each approach is accompanied with publicly available software and we include the simple commands used in our analysis. Our results show that most players do not stand out as measurably strong (positive or negative) contributors. This allows the stars to really shine, reveals diamonds in the rough overlooked by earlier analyses, and argues that some of the highest paid players in the league are not making contributions worth their expense.

Keywords: Bayesian shrinkage; lasso; logistic regression; regularization; sports analytics

Corresponding author: Robert B. Gramacy, Booth School of Business, The University of Chicago, 5807 S Woodlawn Ave, Chicago, IL 60637, USA, Tel.: +773-702-0739


Published Online: 2013-03-30


Citation Information: Journal of Quantitative Analysis in Sports. Volume 9, Issue 1, Pages 97–111, ISSN (Online) 1559-0410, ISSN (Print) 2194-6388, DOI: https://doi.org/10.1515/jqas-2012-0001, March 2013

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