I have 1 continuous DV and 1 categorical IV with 4 levels. I set up orthogonal dummy coding for 3 planned contrasts. I then used the linear model to observe if the planned contrasts are significant.
My question is, do I have to use a Bonferroni correction in this instance? The sites I've read says that it is necessary when conducting multiple comparisons using t-test but as I'm using the linear model should I still correct the alpha?