Displaying 5 results from an estimated 5 matches for "standlrt".
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2005 Jul 12
2
testing for significance in random-effect factors using lmer
Hi, I would like to know whether it is possible to obtain a value of
significance for random effects when aplying the lme or related
functions. The default output in R is just a variance and standard
deviation measurement.
I feel it would be possible to obtain the significance of these random
effects by comparing models with and without these effects. However,
I'm not used to perform
2007 Jun 10
1
{nlme} Multilevel estimation heteroscedasticity
Dear All,
I'm trying to model heteroscedasticity using a multilevel model. To
do so, I make use of the nlme package and the weigths-parameter.
Let's say that I hypothesize that the exam score of students
(normexam) is influenced by their score on a standardized LR test
(standLRT). Students are of course nested in "schools". These
variables are contained in the Exam-data in the mlmRev package.
library(nlme)
library(mlmRev)
lme(fixed = normexam ~ standLRT,
data = Exam,
random = ~ 1 | school)
If I want to model only a few categories of variance, all works fin...
2007 Jul 30
1
Extract random part of summary nlme
...w:
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...
2007 Jul 31
1
Extracting random parameters from summary lme and lmer
...w:
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...
2007 Jul 30
0
Extracting random parameters from summary lme
...w:
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...