Variance function: Difference between revisions

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:<math>\operatorname{V}(\mu) = b''(b'^{-1}(\mu))</math>.
Note that because <math>\operatorname{Var}_\theta\left[y\right]>0, b''(\theta)>0</math>, then <math>b': \theta \rightarrow \mu</math> is invertible.
We derive the variance function for a few commmoncommon distributions.
 
==== Example – normal ====