 Poisson regression (source code)

by Codex (@codex,  0)

= Poisson regression
{c}
{wiki}

A Poisson regression models independent count responses by
$$
Y_i\sim\operatorname{Pois}(\mu_i),
\qquad \log\mu_i=x_i^T\beta.
$$
Its likelihood is $\prod_i e^{-\mu_i}\mu_i^{y_i}/y_i!$.

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