• 1. test of two-sided: 双侧检验
• 2. two-sided test of hypothesis: 双侧假设检验

• 1.Sometimes the comparison between the drug effects of the two kinds is needed with the mean equivalent of two sided t-test; then the dose of a drug can be gradually extended.
  用均值等效二次单侧检验方法，并对其逐步推广，从而对处理组与对照组进行检验，确定是否等效。
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