Displaying 20 results from an estimated 8000 matches similar to: "Workshop on multilevel modeling in R"
2018 Apr 13
0
Longitudinal and Multilevel Data in R and Stan: 5-day workshop May 28 to June 1, 2018
Longitudinal and Multilevel Data in R and Stan
ICPSR short course: May 28 to June 1, 2018
May 28: Introduction to R by John Fox
May 29 to June 1: Longitudinal and Multilevel Data in R and Stan by Georges Monette
Sponsored and organized by ICPSR, University of Michigan and
held at York University in Toronto, Ontario
Course description:https://www.icpsr.umich.edu/icpsrweb/sumprog/courses/0226
2004 Feb 05
1
Multilevel in R
Hello,
I have difficulties to deal with multilevel model. My dataset is composed
of 10910 observations, 1237 plants nested within 17 stations. The data set is not
balanced. Response variable is binary and repeated.
I tried to fit this model
model<- glmmPQL( y ~ z1.lon*lun + z2.lat*lun + z1.lon*lar + z2.lat*lar + z1.lon*sca + z2.lat*sca +z1.lon*eta + z2.lat*eta,
random = ~ lun + lar + sca
2011 Sep 07
1
Reshaping data from wide to tall format for multilevel modeling
Hi,
I'm trying to reshape my data set from wide to tall format for multilevel
modeling. Unfortunately, the function I typically use (make.univ from the
multilevel package) does not appear to work with unbalanced data frames,
which is what I'm dealing with.
Below is an example of the columns of a data frame similar to what I'm
working with:
ID a1 a2 a4 b2 b3 b4 b5 b6
Below
2010 Mar 26
1
Multilevel modeling with count variables
I am using a multilevel modeling approach to model change in a person's
symptom score over time (i.e., longitudinal individual growth models). I
have been using the lme function in the multilevel package for the analyses,
but my problem is that my outcome (symptoms) and one of my predictors
(events) are count data, and are non-normal. Do you have any suggestions
for how to deal with them?
2006 Mar 01
1
Book: Multilevel Modeling in R ETA?
Hi R folks (Dr. Bates in particular),
In August 2005, Dr. Bates mentioned that the documentation for lme4
"will be in the form of a book with the working title 'Multilevel
Modeling in R'" and I'm just wondering if there is an estimated date of
publication or if it's still a long way off. The Rnews article does a
great job of introducing the package, but I'm
2009 Mar 17
2
Multilevel modeling using R
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:
2009 Mar 11
1
Multilevel Modeling using glmmPQL
Hi,
I'm trying to perform a power simulation for a simple multilevel
model, using the function glmmPQL in R version 2.8.1. I want to extract
the p-value for the fixed-effects portion of the regression, but I'm
having trouble doing that. I can extract the coefficients
(summary(fit)$coeff), and the covariance matrix (summary(fit)$varFix),
but I can't grab the p-value (or the
2005 Nov 27
2
multilevel models and sample size
It is not a pure R question,but I hope some one can give me advices.
I want to use analysis my data with the multilevel model.The data has 2 levels---- the second level has 52 units and each second level unit has 19-23 units.I think the sample size is quite small,but just now I can't make the sample size much bigger.So I want to ask if I use the multilevel model to analysis the data set,will
2012 Apr 30
3
R2 in multilevel modelling
Goodmorning everybody,
i'm an italian statistician and i'm using R for research.
Could someone tell me some indices to see the goodness of fit in multilevel
modelling?
I'm using the lmer function, and I want to know if my model fit well my
data.
I actually want to justify the use of multilevel model instead the classical
one.
Hope someone can help me.
Thank you.
Greetings
2012 Jun 10
2
sampling weights for multilevel models
Dear all,
I am struggling with a problem which I have been reading on the forums about
and it did not seem to me that there is a precise answer to my question.
However, I still hope there is one.
I am working with http://timss.bc.edu/ PIRLS data and trying to conduct
multilevel analysis. There are different weights for each level of analysis
in the PIRLS dataset (e.g. there is a school
2006 Nov 07
3
question on multilevel modeling
Hi,
I am trying to run a multilevel model with time nested in people and
people nested in dyads (3 levels of nesting) by initially running a
series of models to test whether the slope/intercept should be fixed or
random. The problem that I am experiencing appears to arise between the
random intercept, fixed slope equation AND.
(syntax:
rint<-lme(BDIAFTER~BDI+WEEK+CORUMTO,
2003 Jun 25
3
joining columns as in a relational database
In our recent workshop on "Multilevel Modeling in R" we discussed
handling data for multilevel modeling. An classic example of such
data are test scores of students grouped into schools. We may wish to
model the scores as functions of both student-level covariates and
school-level covariates.
Such data are often organized in a multi-table format with a separate table
for each level of
2003 Aug 25
2
Book recommendations: Multilevel & longitudinal analysis
Hi, does anyone out there have a recommendation for multilevel / random
effects and longitudinal analysis?
My dream book would be something that's both accessible to a
non-statistician but rigorous (because I seem to be slowly turning into a
statistician) and ideally would use R.
Peter
2003 Apr 08
3
Multilevel Analyses in R
I am new to R and would like to get some practice analyzing multilevel data. I wonder if anyone can point me to a sample data set and command lines that I might replicate for a sample session. I would then compare my output with HLM output.
Any help is appreciated.
------
Harold C. Doran
Director of Research and Evaluation
New American Schools
675 N. Washington Street, Suite 220
Alexandria,
2006 Oct 02
1
multilevel factor model in lmer
Hello --
I am curious if lmer can be used to fit a multilevel factor model such as a
two-parameter item response model. The one parameter model is
straightforward. A two-factor model requires a set of factor loadings
multiplying a single random effect. For example, a logit model for the ith
subject responding correctly to the jth item (j=1,..,J) is
logit[p(ij)] = a1*item1(i) + ... + aJ *
2010 Jul 14
1
Multilevel IRT Modelling
Dear All,
does anybody know of a package (working under Linux) for multilevel IRT
modelling?
I'd love to do this without having to go on WINSTEPS or the like..
thanks for the attention!
Federico Andreis
-----
Dr. Federico Andreis
Universit? degli Studi di Milano-Bicocca, PhD Student
MEB Department, Karolinska Institutet, Stockholm, Visiting PhD Student
--
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2010 Mar 06
2
Plot interaction in multilevel model
I am trying to plot an interaction in a multilevel model. Here is some
sample data. In the following example, it is longitudinal (i.e., repeated
measures), so the outcome, score (at each of the three time points), is
nested within the individual. I am interested in the interaction between
gender and happiness predicting score.
id <- c(1,1,1,2,2,2,3,3,3)
age <-
2007 Apr 16
1
Modelling Heteroscedastic Multilevel Models
Dear ListeRs,
I am trying to fit a heteroscedastic multilevel model using lmer{lme4-
package). Take, for instance, the (fictive) model below.
lmer(test.result ~ homework + Sex -1 + (1 | School))
Suppose that I suspect the error terms in the predicted values to
differ between men and women (so, on the first level). In order to
model this, I want the 'Sex'-variable to be random on
2006 Oct 22
1
Multilevel model ("lme") question
Dear list,
I'm trying to fit a multilevel (mixed-effects) model using the lme function
(package nlme) in R 2.4.0. As a mixed-effects newbie I'm neither sure about
the modeling nor the correct R syntax.
My data is structured as follows: For each subject, a quantity Y is measured
at a number (>= 2) of time points. Moreover, at time point 0 ("baseline"), a
quantity X is
2005 Aug 03
2
Multilevel logistic regression using lmer vs glmmPQL vs. gllamm in Stata
Dear all,
I am trying to replicate some multilevel models with binary outcomes
using R's "lmer" and "glmmPQL" and Stata's gllmm, respectively.
The data can be found at <http://www.uni-koeln.de/~ahf34/xerop.dta>.
The relevant Stata output can be found at <http://www.uni-
koeln.de/~ahf34/stataoutput.txt>. First, you will find the
unconditional model,