[Retracted] Wavelet-Based Multiscale Decomposition Algorithm for Trajectory Capture of Tennis Serves

Table 3

Men’s serving score ladder division.

Ladder division	Shoulder hip twist angle when raising the racket in one shot	Shoulder hip twist angle at first shot	The angle of shoulder-hip twist when raising the racket for the second shot	Shoulder hip twist angle during the second shot
Secondary ladder	33.847	35.678	30.4039	41.579
Third step	35.193	29.457	33.444	30.847
Fourth step	21.124	26.729	28.1025	36.159