degrees of freedom
DegreesOfFreedom
2007-06-01 19:34:35
2008-10-19 19:34:47
Definition
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\PMlinkescapeword{distribution}
The number of \emph{degrees of freedom} of a \PMlinkname{distribution}{Distribution3} is the number of parameters that are used to \PMlinkescapetext{calculate} the value of the distribution and are either known or assumed to be independent.
The following use degrees of freedom:
\begin{itemize}
\item chi-squared random variable
\item chi-squared statistic
\item F distribution
\item non-central chi-squared random variable
\item t distribution
\end{itemize}
{\bf Remark:}
The number of \emph{degrees of freedom} has also a physical meaning
related to the possible directions of motion of the system.