When to use data transformations
Good afternoon, I am constructing a LMM and have created a QQ plot attached in image 1. The conditional residuals seem to deviate from normality a fair bit so I transformed the response variable data using log base 10. This improved my R^2 by about 2% and the QQ plot seems a bit better (image 2). However, I'm not sure if these slight improvements are worth the transformation? As I would then have...