R tutorial: Multilevel models part 1, variance components in random intercept models

[@hm.91]

Very good lecture. Thanks!

[@gustavorm5686]

Good job. Very didactic.

[@lizzy3781]

Hi, I have done a simple lm for single level data. How can I get the standard error in the residual variance? I get the residual variance by squaring sigma from the model summary. Thanks!