For each sample
data, after the orthogonal discrete wavelet transform were
calculated on dataset including 256 points, there are eight
levels of the decomposition, and the wavelet coefficients
corresponding to each level were obtained[5-8]. As we known,
the energy at each resolution level can discover the detail signal
containing significant information about the intrinsic nonlinear
dynamics of human movement, that is, the energy distribution
between different wavelet levels could contain the significant
differences information