国家计量技术规范ＪＪＦ１０５９—１９９９《测量不确定度评定与表示》中的第２ １８条款 ,关于自由度的解释 :“自由度反映相应实验标准差的可靠程度 ,……”。据此 ,我对自由度的理解、体会是 :自由度越大 ,可靠程度越高 ;自由度越小 ,可靠程度越低。这从下面的贝塞尔公式中 National Measurement Specifications JJF1059-1999 “Measurement Uncertainty Evaluation and Expression” in Article 2 18, on the degree of freedom of interpretation: “degree of freedom reflects the corresponding experimental standard deviation of the degree of reliability, ... ...”. Accordingly, I understand the degree of freedom, experience is: the greater the degree of freedom, the higher the degree of reliability; the less the degree of freedom, the lower the degree of reliability. Here’s the Bessel formula below