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  observation \eqn{i} is an average of \eqn{w_i} observations, which is
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  observation \eqn{i} is an average of \eqn{w_i} observations, which is
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  natural for binomials specified as proportions but less so for a
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  natural for binomials specified as proportions but less so for a
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  Poisson, for which prior weights are ignored with a warning.
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  Poisson, for which prior weights are ignored with a warning.
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  For a gamma GLM the shape parameter is estimated by maximum likelihood
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  For a gamma GLM the shape parameter is estimated by maximum likelihood
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  (using function \code{\link[MASS:gamma.shape.glm]{gamma.shape}} in package
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  (using function \code{\link[MASS]{gamma.shape}} in package
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  \CRANpkg{MASS}).  The interpretation of weights is as multipliers to a
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  \CRANpkg{MASS}).  The interpretation of weights is as multipliers to a
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  basic shape parameter, since dispersion is inversely proportional to
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  basic shape parameter, since dispersion is inversely proportional to
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  shape.
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  shape.
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  For an inverse gaussian GLM the model assumed is
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  For an inverse gaussian GLM the model assumed is