Examining an outcome longitudinally, if some data points are positively skewed, should the other data points be log transformed as well?

We measured CD4 levels over 12 months, and the levels are skewed at 2 of the 12 data points. In running a longitudinal analysis (e.g., mixed models) with CD4 as the outcome, should I correct for...

09 September 2016 6,455 4 View