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Reduced chi-squared statistic
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<p>In <a href="/facts/Statistics/DNPsKGYU">statistics</a>, the reduced chi-square statistic is used extensively in <a href="/facts/Goodness_of_fit/qlTfUIfS">goodness of fit</a> testing. It is also known as mean squared weighted deviation (MSWD) in <a href="/facts/Isotopic_dating/bDFjdPqV">isotopic dating</a> and variance of unit weight in the context of <a href="/facts/Weighted_least_squares/BpCgNF5m">weighted least squares</a>. </p><p>Its square root is called regression standard error, standard error of the regression, or standard error of the equation (see <a href="/facts/Ordinary_least_squares/q7H9k5vM">Ordinary least squares § Reduced chi-squared</a>) </p>