“…As the team's outcome always depends on the opponent, we also control for the strength of the opponent (Leard & Doyle, ; Weimar & Wicker, ). Using ex ante winning probabilities in terms of standardized betting odds from “interwetten.com” is one common procedure to incorporate uncertainty and difference in team quality (eg, Peel & Thomas, ; Soebbing, Wicker, & Weimar, ) . Moreover, season, weekday, and hour times were generated to catch further unobserved heterogeneity within a player's effort investment.…”