Notice of RetractionComments on the researches of the effection of head-coach changing on professional sport teams´ performance

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

After analyseing the related researches during the last 45 years, we found that because of the inconsistent conclusions and there is little testing research for each view, and researchers didn´t indentify an exact sample from the mixed head-coach change model, there is no research conclusion adopted in practice and there is no experiement research. Match results can´t represent team performance, because they are different. There maybe many research methods,but the researchers should find a model which is exact. The future researchers need to find the effection of head-coach change under special circumstance, and assess the teams´ performance objectively.