Jing Zhou, Jiankun Zhu, Meijuan Chen, Miao Jiang, Zongming Zhang, Zhen Zhan, Xu Zhang
Logical thinking in pattern differentiation of traditional Chinese medicine
Journal of traditional Chinese medicine = Chung i tsa chih ying wen pan
widely incorrectly believed ttest linear regression valid normally distributed outcomes ttest linear regression compare mean outcome variable different subjects valid even small samples outcome variable normally distributed major usefulness comes fact large samples valid distribution demonstrate validity simulation extremely nonnormal data discuss situations methods wilcoxon rank sum test ordinal logistic regression proportional odds model recommended conclude ttest linear regression often provide convenient practical alternative major limitation ttest linear regression inference associations distributional one whether detecting estimating difference mean outcome answers scientific question hand