LS,
I'm estimating multilevel regression models, using the lme-function
from the nlme-package. Let's say that I estimated a model and stored
it inside the object named 'model'. The summary of that model is
shown below:
Using summary(model)$tTable , I receive the following output:
> summary(model)$tTable
Value Std.Error DF t-value p-value
(Intercept) 0.23268607 0.09350662 3990 2.4884449 1.287080e-02
sexM -0.15338225 0.03169762 3990 -4.8389206 1.354802e-06
standLRT 0.38593558 0.01677195 3990 23.0107762 4.005182e-110
vrmid 50% 0.07606394 0.09389376 61 0.8101064 4.210281e-01
vrtop 25% 0.24561327 0.10483374 61 2.3428838 2.241317e-02
intakemid 50% -0.41469716 0.03177240 3990 -13.0521199 3.698344e-38
intaketop 25% -0.75920783 0.05357980 3990 -14.1696648 1.666780e-44
typeSngl 0.15680532 0.07173835 61 2.1857949 3.267903e-02
All looks fine to me. The output above is simply a section from the
full summary shown below. Now, I want to extract from the summary (or
the full model) the part stating the random parameters. More
specifically, I want to extract from the summary the following:
(Intercept) 0.2869401 (Intr)
typeSngl 0.2791040 -0.617
Residual 0.7302233
How could this be done?
Thanks for the effort,
Rense Nieuwenhuis
Linear mixed-effects model fit by REML
Data: Exam
AIC BIC logLik
9158.56 9234.241 -4567.28
Random effects:
Formula: ~type | school
Structure: General positive-definite, Log-Cholesky parametrization
StdDev Corr
(Intercept) 0.2869401 (Intr)
typeSngl 0.2791040 -0.617
Residual 0.7302233
Fixed effects: normexam ~ sex + standLRT + vr + intake + type
Value Std.Error DF t-value p-value
(Intercept) 0.2326861 0.09350662 3990 2.488445 0.0129
sexM -0.1533822 0.03169762 3990 -4.838921 0.0000
standLRT 0.3859356 0.01677195 3990 23.010776 0.0000
vrmid 50% 0.0760639 0.09389376 61 0.810106 0.4210
vrtop 25% 0.2456133 0.10483374 61 2.342884 0.0224
intakemid 50% -0.4146972 0.03177240 3990 -13.052120 0.0000
intaketop 25% -0.7592078 0.05357980 3990 -14.169665 0.0000
typeSngl 0.1568053 0.07173835 61 2.185795 0.0327
Correlation:
(Intr) sexM stnLRT vrm50% vrt25% int50% int25%
sexM -0.201
standLRT -0.125 0.028
vrmid 50% -0.742 0.028 -0.035
vrtop 25% -0.652 0.051 -0.065 0.649
intakemid 50% -0.246 -0.011 0.541 -0.002 0.007
intaketop 25% -0.218 -0.018 0.676 0.014 0.013 0.660
typeSngl -0.421 0.080 0.007 0.033 -0.027 -0.001 0.001
Standardized Within-Group Residuals:
Min Q1 Med Q3 Max
-3.59074329 -0.63776965 0.03829878 0.67303837 3.33952680
Number of Observations: 4059
Number of Groups: 65
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