Dear list:

Thanks a lot for help. I have a question and I could not find clear answers
easily.

When we do logistic regression for one type of events of interest as a
proportion of a broader types of events, does the logistic regression assume
that the number of whole types of events should be independent with the
number of type of interest?

For example, if one type of events and the whole type of events are two time
series of count number, but they vary in a same fashion (both increase or
decrease with time), can we still use logistic regression to figure out the
time's effect on proportion? If not, what is right thing to do?

Many thanks,

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