degrees of freedom

The number of degrees of freedom of a distribution (http://planetmath.org/Distribution3) is the number of parameters that are used to the value of the distribution and are either known or assumed to be independent.

The following use degrees of freedom:

•
chi-squared random variable
•
chi-squared statistic
•
F distribution
•
non-central chi-squared random variable
•
t distribution

Remark:The number of degrees of freedom has also a physical meaningrelated to the possible directions of motion of the system.

单词	DegreesOfFreedom
释义	degrees of freedom The number of degrees of freedom of a distribution (http://planetmath.org/Distribution3) is the number of parameters that are used to the value of the distribution and are either known or assumed to be independent. The following use degrees of freedom: • chi-squared random variable • chi-squared statistic • F distribution • non-central chi-squared random variable • t distribution Remark:The number of degrees of freedom has also a physical meaningrelated to the possible directions of motion of the system.
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