www.cmm.bristol.ac.uk/forum

btw, I centered both age terms around their minimum. when doing this there is zero intercept variance at level 2. I just tried what happens when I center around the grand mean: suddenly there is level 2 and level 1 intercept variance, but the slope variances turn zero. It's a mystery to me.

I have the same problem, but allowing for negative numbers did not solve it because the model did not converge. I have a repeated measures model with time as level 1 and participant as level 2. I started with an intercept that is random at both levels, then I added age as predictor with a random ...