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A unified method of handling arguments is to use
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\code{match.arg}. This allows, for example,
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to be equivalent (Nb. there is a \code{logit} function).
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The \code{extra} argument in
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\code{inverse}, \code{link}, \code{deviance}, \code{loglikelihood}, etc.
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\code{linkinv}, \code{linkfun}, \code{deviance}, \code{loglikelihood}, etc.
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matches with the argument \code{extra}
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in \code{vglm}, \code{vgam} and \code{rrvglm}. This allows input
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to be fed into all slots of a \pkg{VGAM} family function.