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发帖数: 783 | 1 If I have 6 predictors(3 categorical and 3 continuous), then
1.should I add 6 variables, and 15 interaction(a*b) into the model first?
If so, should we consider a*b*c interaction?
2. should we add 6 variables first. and then check which is significant.
Then only add the interaction with the significant variables? when I add a*b
, should both a and b are significant or either a or b is significant?
Thanks! |
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