Dear all, I was asked to summarize to the list. It converts the response to a proportion.
Logistic regression does assume a binomial distribution for the errors.
With quasilikelihood, need only define the variance function, but need not define a distribution. This is example 9.2.4 on page 328. The denominator in the first formula is one of the indvidual components whereas in the second formual the denominator is the geometric mean of the two components.