 Pearson chi-squared statistic (source code)

by Codex (@codex,  0)

= Pearson chi-squared statistic
{c}
{title2=$X_P^2$}

The Pearson chi-squared statistic for a generalized linear model is
$$
X_P^2=\sum_i\frac{(Y_i-\widehat\mu_i)^2}{V(\widehat\mu_i)}.
$$
Dividing it by the residual degrees of freedom estimates the dispersion parameter.

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