球員在合約年與非合約年績效–以 NBA 為例

Abstract

本研究目的在探討（一）球員簽約前與簽約後績效是否存在差異？（二）球員績效表現與球員薪資之關聯性為何？（三）DEA績效值與NBA官方績效值對薪資解釋力是否有差異？本研究選取2000年至2011年共11年間曾經歷合約到期並再次向球團簽訂複數年合約共184名球員做為研究樣本。本文採用資料包絡分析法、無母數分析法及多元迴歸衡量NBA球員之績效值。實證結果發現：（一）球員簽約前後具有顯著差異。亦即：球員在簽約前較球員簽約後績效較佳。（二）績較表現較佳之球員具有較高的薪資。（三）根據Vuong Test比較NBA官方提供績效值與DEA法計算出之績效值和球員每分鐘績效值與薪資關聯性的測試結果，顯示由官方提供之績效值對薪資關聯性解釋力較高，此結果說明目前NBA官方所提供之績效值仍是球團用來與球員薪資的談判重要參考指標之一。

This study aims at (1) after the player before signing with contract performance whether there are differences? (2) players of performance associated with the player payroll of why? (3) DEA performance value to pay the NBA official performance value to explain whether there is any difference? select between 2000 and a total of 11 years in this study had experienced contract expires and again between plural years contract to pellet a total of 184 players as research samples. This article number complex analysis, no master data analysis and Multivariate regression to measure performance of NBA players. Empirical results found that: (1) the players before and after signing with significant differences. Namely: players before signing a player after signing a better performance. (2) performance better and better players with a higher salary. (3) The Vuong test results reveal that the official NBA efficiency score has a higher association with salary comparing with DEA efficiency score. The finding suggests that the official efficiency score is one of the major references for the NBA teams on salary arbitration.