Model Validation The whiteness of the residual signal can be checked by the following statistical techniques Autocorrelation test(自相关检测) Power spectrum density test(功率谱密度检测) Partial autocorrelation test(部分自相关检测) 11 •Autocorrelation test（自相关检测） •Power spectrum density test（功率谱密度检测） •Partial autocorrelation test （部分自相关检测） The whiteness of the residual signal can be checked by the following statistical techniques Model Validation