科研设计应遵守重复原则

在科学研究中必须要有＂重复＂,因为我们观测的是随机变量的变化规律,而这种变化规律在少数几次实验中不易表现出来,即实验要求一定的重复数（样本例数）,目的是使均数逼真,并稳定标准差,只有这样来自样本的统计量才能代表总体的参数,统计推断才可靠。本文从基本常识、专业知识和统计学的角度,结合具体实例,探讨在科研中如何把握好重复原则。

The repetition principle in scientific research

The repetition principle is important in scientific research,because the observational indexes are random variables,which require a certain amount of samples to reveal their changing regularity.The repetition principle stabilizes the mean and the standard variation,so that statistics of the sample can well represent the parameters of the population.Thus,the statistical inference will be reliable.This article discussed the repetition principle from the perspective of common sense and specialty with examples.