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Line 177: :<math>\frac{\partial \eta}{\partial \mu} = g'(\mu)</math> we have that :<math>\frac{\partial l}{\partial \beta_r} =~~\frac{~~ (y-\mu~~}{\phi~~ })W\frac{\partial \eta}{\partial \mu}x_r</math> The Hessian matrix is determined in a similar manner and can be shown to be,

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