首先在确定实体自由现金流量序列存在趋势的情况下，利用曲线拟合模型描述实体自由现金流量的趋势成分，并对模型拟合得是否理想进行相应的检验；
First , the part makes certain on the trend element of entity free cash flow through curve estimation models on the basis that the series of entity free cash flow has a trend , and tests whether the models are ideal or not .
实体现金流量