Timeline for How to compute significant interaction estimates when main effect is not significant?
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| May 25, 2012 at 9:12 | comment | added | Felix S | If you have cross-over interactions, this might et difficult, indeed. But I think in your case the main question would be: did you expect a positive main effect of 'year'? Then add it to all slopes. | |
| May 24, 2012 at 23:52 | comment | added | Jdub | This is interesting (thank you), but I don't know if I would do that. If you had a positive, but non-significant, slope for a main effect, and a significant positive slope in one group with a significant negative slope in a second group, it seems that you would, following this advice, add the n.s. main effect to the positive within group slope but not to the negative within group slope. This sounds kind of fishy to me. | |
| May 24, 2012 at 7:57 | history | answered | Felix S | CC BY-SA 3.0 |