search for: varait

...I inferred that this trend occurred because my fixed effect was a two-level factor, and my random effect was a 12-level factor. The negative residuals were associated with negative random effects (because of shrinkage, I assume), and the positive with positive. The fixed effects explained little varaition. Therefore plotting the innermost residuals against the innermost fitted values had the negative residuals to the left and the positive residuals to the right, occasioning a trend. My questions are: is it (as I suspect) harmless, or does it suggest that the model is lacking? And, is this effec...