(1) Is it possible to fit a multilevel latent growth curve model by the SEM framework in lavaan?
(2) If yes is my specification of the "configural / formative construct"** model, where the construct of interest is both within and between level right?
(3) Is is I possible to define an “between only construct” model**, where the construct of interest is the between level only, because I am only interested in the school effect.
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lavaan 0.6-2 ended normally after 59 iterations
Optimization method NLMINB
Number of free parameters 20
Number of equality constraints 6
Used Total
Number of observations 1113 1355
Number of clusters [id_schule] 41
Estimator ML
Model Fit Test Statistic 78.919
Degrees of freedom 10
P-value (Chi-square) 0.000
Parameter Estimates:
Information Observed
Observed information based on Hessian
Standard Errors Standard
Level 1 [within]:
Latent Variables:
Estimate Std.Err z-value P(>|z|)
iW =~
theta0 1.000
theta1 1.000
theta2 1.000
sW =~
theta0 0.000
theta1 1.000
theta2 2.000
Regressions:
Estimate Std.Err z-value P(>|z|)
iW ~
geschlecht_all 0.178 0.057 3.144 0.002
migrat_dmmy_ll 0.370 0.089 4.175 0.000
sescen 0.009 0.002 4.944 0.000
sW ~
geschlecht_all 0.000
migrat_dmmy_ll 0.020 0.050 0.393 0.694
sescen 0.000
Covariances:
Estimate Std.Err z-value P(>|z|)
.iW ~~
.sW -0.015 0.031 -0.497 0.619
Intercepts:
Estimate Std.Err z-value P(>|z|)
.iW (rImn) -0.149 0.096 -1.552 0.121
.sW (rSVr) 0.391 0.028 14.147 0.000
.theta0 0.000
.theta1 0.000
.theta2 0.000
Variances:
Estimate Std.Err z-value P(>|z|)
.iW (rIsl) 0.638 0.067 9.480 0.000
.sW (rSsl) 0.026 0.022 1.193 0.233
.theta0 0.786 0.064 12.233 0.000
.theta1 0.543 0.033 16.241 0.000
.theta2 0.430 0.048 9.016 0.000
Level 2 [id_schule]:
Latent Variables:
Estimate Std.Err z-value P(>|z|)
iB =~
theta0 1.000
theta1 1.000
theta2 1.000
sB =~
theta0 0.000
theta1 1.000
theta2 2.000
Covariances:
Estimate Std.Err z-value P(>|z|)
iB ~~
sB -0.142 0.049 -2.901 0.004
Intercepts:
Estimate Std.Err z-value P(>|z|)
iB (rImn) -0.149 0.096 -1.552 0.121
sB (rSVr) 0.391 0.028 14.147 0.000
.theta0 0.000
.theta1 0.000
.theta2 0.000
Variances:
Estimate Std.Err z-value P(>|z|)
iB (rIsl) 0.638 0.067 9.480 0.000
sB (rSsl) 0.026 0.022 1.193 0.233
.theta0 (rsv2) 0.029 0.010 2.845 0.004
.theta1 (rsv2) 0.029 0.010 2.845 0.004
.theta2 (rsv2) 0.029 0.010 2.845 0.004
In the context of latent growth models what means measurement variance?
I think for my data a multilevel model does not work (?). The only way I could avoid negative variances for the slope at the between level is by specifying the variances of the latent intercept and slopes equal between the levels, and I have to restrict the error variances at the between level (highlighted green in the output). Do you know this phenomenon? Which seems for me to force the model to fit with unreasonable constraints.
Could I ask you how do you use ICC measures in practice? Do you prefer certain ICC measures?