Are lmer-coefficients standardized or not?

Question

I have a very basic question; maybe a bit too basic to find a helpful response googeling it.

I am calcultating multi-level-models using the lmer function using this code:

lmer(H1_rirs, data= df_long_cl, REML = T)

Am I right in assuming that the retrieved coefficients are unstandardized? If yes, is there an easy way to standardize them?

Best,

Carolin

Answer 1

Yes, by default, no standardizing is applied. If you like to get standardized coefficients, one way would be to standardize the data before fitting your model. There is a robust implementation of such a function in the effectsize-package. Or you can do some post-hoc standardization (also effectsize-package). The latter yields different results, the most accurate would be standardizing the data before model fitting.