抄録
The purpose of this study was to predict victory or defeat in the volleyball game from the difference in scores between the teams.
We observed 28 games, 92 sets of the 1999 Spring League Match among 8 Intercollegiate Women's Volleyball Teams in Zenkyusyu.
Each set of a game was divided into the early stage (from 0 point to 8 point), the middle stage (from 10 point to 16 point) and the end stage (from 18 point to 22 point). The difference in scores between the teams was caluculated for each stage of a set. And the regression coefficient between the score differences and the percentages of winning the set was calculated.
The major results of this study were as follows: 1 It was possible to predict winning a set or not from the score difference between the teams because there was a significant correlation between the score and the winning rate.
2 The winning rate became more than 70% when the team led the opponent team by 3 points in the early stage. Then the winning rate became 0% when the team was 6 points or more behind the opponent team.
3 The winning rate became more than 90% when the team led the opponent team by 4 points in the middle stage. Then the winning rate became 0% when the team was 6 points or more behind the opponent team,
4 The winning rate became 90% or more when the team led the opponent team by 2 points in the end stage.
