The rank sum test is an important nonparametric statistical method that can be used to analyze experimental data in animal ecology.
秩和检验法是非参数统计法中的一种重要方法，是对成组数据t 检验的一个补充。
2
The model is characterized by the non-parametrictest. With the method of two-staged classification process, the paper discriminated the credit conditions of enterprises .