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在统计学上,自由度的概念十分广泛,在对自由度的概念进行界定时,狭义上,在对总体的参数进行估计时,在样本中,能自由变化,或者自变量的个数能独立,我们称之为统计量的自由度。在社会经济的统计实践中,房地产价格变化和居民消费情况的统计等社会调查都是建立在统计抽样的基础上完成的,这种方法的优点在于只要通过样本的信息,就能够推测出总体的情况。自由度的概念涉及范围很广泛,样本的参数估计、系统的推断和统计的检验工作都会涉及到,但是当前我国对自由度产生的背景、性质和原因在教材上并没有给出充分的解释,对自由度的概念也没有规范化的诠释。
In statistics, the concept of degree of freedom is very broad. When defining the concept of degree of freedom, in a narrow sense, when estimating the overall parameters, they can freely change in the sample or the number of independent variables can be independent , We call it the degree of freedom of statistics. In the socio-economic statistical practice, social surveys such as changes in real estate prices and the statistics of household consumption are all based on statistical sampling. The advantage of this method is that as long as the sample information is passed, it can be estimated that the overall Happening. The concept of degree of freedom involves a very wide range. The sample parameter estimation, system inference and statistical test will all be involved. However, the current background, nature and causes of freedom in our country are not fully explained in the textbooks. The concept of freedom has no normative interpretation.