hi
i am running logistic regression with three independent variables, i want
to introduce a time variable as the data was collected at two time period
but not on the same people
i want to see if there is a significant different in responses over time
one option is just to add the time variable to the model, or would an
alternative be to introduce the time variable as an interaction with the
other three (all categorical variables) variables
if i use the interaction how would the interaction term be interpretered
thanks
ann
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ann e fitzmaurice
medical statistician
dugald baird centre for research on women's health
dept of obs and gynae
aberdeen maternity hospital
aberdeen
scotland ab25 2zl
tel 01224 553876
fax 01224 553708
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