Hi all,

I have major heterogeneity in variances across labs (100-fold). There is no
apparent variance heterogeneity across y-hat. By using lme4 in the following
way, am I accounting for the variance differences in labs?:

lmer(y ~ fixed1 + covariates + (fixed1|labs))

I'm not sure that it is - I think it is only allowing the means (slopes
[conditional means] & intercepts) to differ between labs. If so, how does
one appropriately model such variances differences?

Thank you in advance,

JJ

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