[求助]自由度是怎么确定的？

The degrees of freedom is the number N of independent observations in the sample (i.e. the sample size) minus the number of statistics (mean, variance etc.) which must be estimated from the sample. Since we typically estimate only one parameter at a time, the number of degrees of freedom is usually calculated as df = N-1.


这是我在资料里面看到的解释，是英语的，我怕自己翻译的不准确，所以直接拷贝过来和同我以前一样迷茫的朋友一起分享