Hello.  I must fit a logistic regression to data in the form of
proportions, but in which some of the proportions are zero.  I therefore
cannot use the glm function with a binomial link since the link function
is not defined for p=0 or 1.  What other solutions are available?  Any
references to this specific problem (i.e. regression using proportions,
of which some are zero) would be welcome.
Thanks.
 

Bill Shipley 

 

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