Message-ID: <38b9f0350903162310wf33a933p58fad3c1d49d3f2c@mail.gmail.com>
Date: 2009-03-17T06:10:28Z
From: ronggui
Subject: Multilevel modeling using R
In-Reply-To: <03D902188378A549B23B5C738E7A4F8653CE20@es58.email.ied.edu.hk>
You can use intervals to get the Confidence intervals of fixed and
random effects.
Best
2009/3/17 WONG, Ka Yau <kayau at ied.edu.hk>:
> Dear All,
>
> ? ? ? ? I use R to conduct multilevel modeling. However, I have a problem about the interpretation of random effect. Unlike the variables in fixed effects, the variables in random effects have not shown the p-value, so I don't know whether they are significant or not? I want to obtain this figure to make the decision. ?Thanks a lot!
>
> Below is the syntax and output of my program:
>
> library(nlme)
> dataset <- read.csv("d:/dataset.csv")
> lme11 <- lme(Overall~1, random=~1|School, method="ML", data=dataset)
> summary(lme11)
>
> Linear mixed-effects model fit by maximum likelihood
> Data: dataset
> ? ? ? AIC ? ? ?BIC ? logLik
> ?12637.06 12656.27 -6315.53
>
> Random effects:
> ?Formula: ~1 | School
> ? ? ? ? ? ? ? ?(Intercept) ?Residual
> StdDev: ? 0.2912031 0.9894488 ? ? ? ?(<-- No p-value)
>
> Fixed effects: Overall ~ 1
> ? ? ? ? ? ? ? ? ? ? ?Value ? ? ?Std.Error ? ? ?DF ? ? t-value ? ? p-value
> (Intercept) 0.7755495 0.06758038 4444 11.47596 ? ? ? 0 ? ? ? ? ? ?(<-- Have p-value)
>
> Standardized Within-Group Residuals:
> ? ? ? ? ?Min ? ? ? ? ? ? ? ? ?Q1 ? ? ? ? ? ? ? ?Med ? ? ? ? ? ? ? ?Q3 ? ? ? ? ? ? ? ? ?Max
> -3.797466473 -0.661750231 -0.007874993 ?0.652625939 ?3.549169733
>
> Number of Observations: 4464
> Number of Groups: 20
>
>
> Best Regards,
> Tommy
> Research Assistant of HKIEd
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.
>
--
HUANG Ronggui, Wincent
Tel: (00852) 3442 3832
PhD Candidate
Dept of Public and Social Administration
City University of Hong Kong
Home page: http://asrr.r-forge.r-project.org/rghuang.html
A sociologist is someone who, when a beautiful women enters the room
and everybody look at her, looks at everybody.