Hi all,
We analyzing data from a multicenter study. To analyze data at a group level, we included an additonal covariate to model the effect "center". Each subject from center 1 got a "1", from center 2 a "2" and so on. Is that the right way? Or does it modell the center effect in a linear way (that would not be good, of course). Would it then be better to include a new factor ("center") with 4 steps?
Can someone help?
Best wishes
Henrike
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