外援政策背景下14~17赛季中超联赛的技战术分析

Technical and Tactical Analysis of Chinese Super League from 2014th to 2017th Season Under the Background of Foreign Aid Policy

为了比较分析中超联赛14到17赛季中不同球队技战术水平的变化,借助机器学习的视频采集技术,根据球的运动轨迹从1920场比赛中获取了上百种动作后,清洗整合成18个有效变量。同时,通过因子分析和聚类降维等统计方法,得到组织能力和进攻能力两大关键指标。在研究前锋球员个人能力方面,得到了31个有效变量,并总结出5大关键指标,即传球、控球、过人、射门、反击。为量化各球队及球员在多种指标下的总得分,以方差贡献率作为权重并对各指标采取按中位数归一的处理进行加权求和。对比球队和球员在这4个赛季下各指标和总得分后发现,17赛季的联赛亮点减少,原因可能存在球员和队伍仍不适应新政策,反映了中超联赛对外援的依赖较重,而忽略了对本土球员的培养目标。

In order to comparatively analyse the changes in the technical and tactical level of different teams in the Chinese Super League from seasons 2014th to 2017th,hundreds of movements were obtained from 1920 games based on the ball trajectory with the help of machine learning video capture technology,and then cleaned and integrated into 18 valid variables.At the same time,two key indicators,organisational ability and offensive ability,were obtained through statistical methods such as factor analysis and cluster dimensionality reduction.In studying the individual ability of the forward players,31 valid variables were obtained and five key indicators were summarised,namely passing,ball control,crossing,shooting and counterattacking.In order to quantify the total score of each team and player under the various indicators,the variance contribution ratio was used as the weight and the indicators were weighted and summed by a treatment of normalisation to the median.Comparing the team and player scores across the four seasons,it was found that the league's highlights in season 2017th were reduced,possibly due to players and teams still not adapting to the new policy,reflecting the Chinese Super League's heavy reliance on foreign aid at the expense of developing local players.