Dear All, I have a simple question that I do not know to define precisely. Suppose I run a logistic regression with a explanatory ordinal variable with for categories, with the first category as refference. Then I agregated the first category with the second (0) and the third with the fouth (1), so that I have now a dummy variable. I run another model. Why is that model a nested one? If it is nested, how do I define what is being tested. I had B1, B2 and B3 as parameter. Now I have one B measures the effect of the third and fourth category compared to the agregation of the two first categories. Thank you in advance. Best regards, Iuri
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