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Fit Analyses |
The function can be expressed
as a function of
,
,and it is called the variance function.
Different choices of the function
generate different distributions in the exponential family.
For a binomial distribution with m trials,
the function
.For other distributions in the exponential
family,
.
SAS/INSIGHT software includes normal, inverse
Gaussian, gamma, Poisson, and binomial
distributions for the response distribution.
For these response distributions,
the density functions
f(y), the variance functions
, and
the dispersion parameters
with function
are
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