Modelling the interaction in game sports - Relative phase and moving correlations

Model building in game sports should maintain the constitutive feature of this group of sports, the dynamic interaction process between the two parties. For single net/wall games relative phase is suggested to describe the positional interaction between the two players. 30 baseline rallies in tennis were examined and relative phase was calculated by Hilbert transform from the two time-series of lateral displacement and trajectory in the court respectively. Results showed that relative phase indicates some aspects of the tactical interaction in tennis. At a more abstract level the interaction between two teams in handball was studied by examining the relationship of the two scoring processes. Each process can be conceived as a random walk. Moving averages of the scoring probabilities indicate something like a momentary strength. A moving correlation (length = 20 ball possessions) describes the momentary relationship between the teams' strength. Evidence was found that this correlation is heavily time-dependent, in almost every single game among the 40 examined ones we found phases with a significant positive as well as significant negative relationship. This underlines the importance of a dynamic view on the interaction in these games.
© Copyright 2006 Journal of Sports Science & Medicine. Department of Sports Medicine - Medical Faculty of Uludag University . All rights reserved.

Subjects: sports game analysis competition theory modelling handball tennis
Notations: training science technical and natural sciences sport games
Published in: Journal of Sports Science & Medicine
Published: 2006
Issue: 5
Pages: 556-560
Document types: article
Language: English
Level: advanced