contrast variation

• 对比变换

contrast variation的用法和样例：

例句

1. Methods In this paper,the authors introduced orthonormal contrast transformation to avid auto-correlation,and proposed the tests of presuppositions by likelihood ratio statistics.
   方法通过标准正交对比变换克服数据间的自相关性，应用似然比统计量进行前提条件的检验。