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y_hat_qs
2003 Jun 25
2
within group variance of the coeficients in LME
...ovariate varies across level 2 units. Pinheiro
Bates suggest just looking at the intervals or doing a rather conservative
ANOVA test in their book. I have also consultet Raudenbush Bryk on the
subject and they suggest using a Chi sqare statistics. It is defined as
follows:
SUM by j( (beta_hat_qj - y_hat_q0 - sum(y_hat_qs*w_sj))^2/V_hat_qqj)
beta are the within 2-level coffecients - got them with the coef()
y is a fixed effect or grand mean
the sum is for accounting of the level 2 predictors, that I don't presently
have, but will
the problem is V_hat_qqj which are the variances of the coefficient...