Displaying 20 results from an estimated 1000 matches similar to: "Duplicating meta-regression results from PROC MIXED with lmer"
2012 Jul 24
1
Annotate forest plot 'forest.rma()' for meta-analysis with metafor package
Dear R-experts,
The forest.rma() function from the metafor package creates nice forest
plots for presenting the results of a meta-analysis. These plots can be
annotated for e.g. giving names to the columns. E.g. as in the
documentation of the package:
data(dat.bcg)
### meta-analysis of the log relative risks using a random-effects model
res <- rma(ai=tpos, bi=tneg, ci=cpos, di=cneg,
2012 Mar 28
0
Major update: meta version 2.0-0
Version 2.0-0 of meta (an R package for meta-analysis) is now available
on CRAN. Changes are described below.
Yours,
Guido
Major revision
R package meta linked to R package metafor by Wolfgang Viechtbauer to
provide additional statistical methods, e.g. meta-regression and other
estimates for tau-squared (REML, ...)
New functions:
- metareg (meta-regression)
- metabias
2012 Mar 28
0
Major update: meta version 2.0-0
Version 2.0-0 of meta (an R package for meta-analysis) is now available
on CRAN. Changes are described below.
Yours,
Guido
Major revision
R package meta linked to R package metafor by Wolfgang Viechtbauer to
provide additional statistical methods, e.g. meta-regression and other
estimates for tau-squared (REML, ...)
New functions:
- metareg (meta-regression)
- metabias
2007 Mar 12
4
meta-regression, MiMa function, and R-squared
Dear Wolfgang Viechtbauer and list members:
I have discovered your "MiMa" function for fitting meta-analytic
mixed-effects models through an earlier discussion on this list. I think
it is extremely useful and fills an important gap. In particular, since
it is programmed so transparently, it is easy to adapt it for one's own
needs. (For example, I have found it easy to identify
2011 Jan 07
1
Random Effects Meta Regression
Hi All,
I have run a series of random effects meta regressions on binomial outcomes
using the metabin function in R. Now I would like to conduct some random
effects meta regressions on the outcomes. Is there a command available which
will allow for me to test the impact of a certain variable on the relative
treatment effect from my meta regressions?
Many Thanks,
Steph
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2009 Aug 22
0
forest (meta) editing text
OK - I've been doing some work on getting a forest plot or two together for a sub-group analaysis. Thats the crucial thing - because its a sub-group analysis rather than a meta-analsysis and all the forest (meta) and forestplot (rmeta) instructions assume you are doing a meta-analysis.
I found rmeta didn't play nicely for me so I'm using the meta package with forest. Here's some
2007 Oct 22
1
Meta-analysis mixed model
I have a meta-analysis dataset which I would like to analyze as a mixed
model, where the y-variable is a measure of effect size, the random effect
is the study from which the effect size was extracted, and the fixed
effect is a categorical explanatory variable. The complication is that we
often have multiple estimates of effect size from a single study (e.g. the
experiment was repeated in
2007 Nov 30
1
meta-analysis on diagnostic tests (bivariate approach)
Hello friends of R list,
Im a physician and Im not that good in statistics. I have posted similar
email in the epi-sig list but no one aswered so far. Im cunducting a
systematic review on two diagnostic test for a particular tropical disease.
I found a free software that make most of the analysis called MetaDiSc.
However there is a paticular analysis that I wuould like to try that it is
not
2006 Apr 06
0
More Logistic Regression Tools?
Frank E Harrell Jr wrote:
> Eric Rescorla <ekr at rtfm.com> wrote:
>
>> (2) I'd like to compute goodness-of-fit statistics for my fit
>> (Hosmer-Lemeshow, Pearson, etc.). I didn't see a package that
>> did this. Have I missed one?
>
> Hosmer-Lemeshow has low power and relies on arbitrary binning of
> predicted probabilities. The Hosmer-Le Cessie
2009 Jul 24
1
metafor
I had found the author's (Wolfgang Viechtbauer) earlier meta-analytic code in R, MiMa, useful. so I have been exploring metafor using an example dataset from MiMa. metafor provides a lot more. However, MiMa provided parameter estimates, standard errors, z values, etc. for individual moderators in the meta-analysis, but I don't see how to obtain these from metafor. Have you any help
2011 May 13
2
L'abbe plot
I cannot seem to get a L'abbe plot to work on R. I do not understand what
the X coordinates, or alternatively an object of class metabin, is
supposed to mean. What is a class of metabin?
Institute of Behavioral Genetics
University of Colorado, Boulder
Whitney.Melroy at Colorado.EDU
2011 May 08
1
Hosmer-Lemeshow 'goodness of fit'
I'm trying to do a Hosmer-Lemeshow 'goodness of fit' test on my logistic
regression model.
I found some code here:
http://sas-and-r.blogspot.com/2010/09/example-87-hosmer-and-lemeshow-goodness.html
The R code is above is a little complicated for me but I'm having trouble
with my answer:
Hosmer-Lemeshow: p=0.6163585
le Cessie and Houwelingen test (Design library): p=0.2843620
2010 Sep 01
1
[Q] Goodness-of-fit test of a logistic regression model using rms package
Hello,
I was looking for a way to evaluate the goodness-of-fit of a logistic regression model. After googling, I found that I could use "resid(fit, 'gof')" method implemented in the rms package. However, since I am not used to the "le Cessie-van Houwelingen normal test statistic," I do not know which statistic from the returned from the "resid(fit,
2007 Jun 21
3
meta-analysis in R
I would like to combine time-series data to test for correlations and
interactions using random and fixed effects meta-analysis.
So, I am looking for the right packages and documentation.
I know about meta and rmeta packages of R.
Are there any more? What are the diffrences in brief?
Can you please suggest some references that could be used as a guide for
meta-analysis in R (or S-plus)?
2007 Sep 25
0
R lmer with problem of 'sd slot has negative entries'
Dear R Users,
I want to fit GLMM with lmer with binomial data and a one-way random
effects model with an overall mean and random effects. From R help,
Laplace is slower than PQL, but more accurate. When I fit my model with
Laplace method with
control = list (usePQL = FALSE)),
for most data sets it works well, but for some I get an error message
(Error in if (any(sd < 0))
2007 Sep 28
0
lmer giving negative, or no, estimated standard errors
R Users,
Emine Bayman sent this out earlier and we do not think it went through.
Appologies if it did.
We want to fit GLMM with lmer with binomial data and a one-way random
effects model (overall mean is a fixed effect and there are random
effects for each binomial).
We are using the Laplace method. We are simulating multiple data sets
and use the
Laplace method with control = list
2012 Apr 12
1
Problem with lmer and fixef
Hello,
I am trying to do contrasts after applying a binomial mixed effect model
with the function lmer. I have to extract the fix effect values, but as I
write fixef(model), I get this error message:
Error in UseMethod("fixef") :
no method for 'fixef' with objects of class "mer"
Has anybody some ideas why? And how can I then post-hoc testing my data if I
cannot do
2010 Jan 18
2
Problem extracting from mer objects
I am having a problem extracting from "mer" objects.
I have constructed my problem using existing datasets.
Using the following commands:
require(lme4)
fm1 <- lmer(Yield ~ 1 + (1 | Batch), Dyestuff)
fixef(fm1)
I get the following error message:
"Error in UseMethod("fixef") : no applicable method for "fixef""
I know that "fixef" is in
2008 Sep 19
0
Error message in lmer
Dear list
I try to run a bootstrap with lmer.
I often, but not always, get the error message:
Error in objective(.par, ...) :
Leading minor of order 6 in downdated X'X is not positive definite
(with the number (here 6) varying)
In R-archives I came across some threads that treated this problem,
nevertheless they refer to lmer when using it with family = "binomial", so
the
2006 Nov 09
2
Meta-regression with lmer() ? If so, how ?
Dear List,
I am (again) looking at meta-regression as a way to refine meta-analytic
results. What I want to do is to assess the impact of some fixed factors
on the results of a meta-analysis. Some of them may be crossed with the
main factor of the meta-analysis (e. g. clinical presentation of a
disease, defining subgroups in each of the studies under analysis), some
of them may be a grouping