A Monte Carlo Test of the Robustness of Parametric and Nonparametric Analysis of Covariance against Unequal Regression Slopes
回归斜率不等时参数与非参数协方差分析稳健性的蒙特卡洛检验AI 解读 ↓
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The power of parametric ANCOVA was compared with the power of three nonparametric ANCOVA techniques both when the parametric assumption of equal slopes was violated and when all parametric assumptions were met. The data situations involved two groups with one covariate and one criterion, normal distributions, equal group sizes, and varying slope combinations. Parametric ANCOVA maintained larger empirical power for nearly all of the data situations. Both parametric and nonparametric techniques appeared not to be robust when violation of the parametric assumption of equal slopes was coupled with unequal group sizes and distributions were normal.