Displaying 20 results from an estimated 600 matches similar to: "GLMM (lme4) vs. glmmPQL output (summary with lme4 revised)"
2005 Jun 16
1
identical results with PQL and Laplace options in lmer function (package lme4)
Dear R users
I encounter a problem when i perform a generalized linear mixed model (binary data) with the lmer function (package lme4)
with R 2.1.0 on windows XP and the latest version of package "lme4" (0.96-1) and "matrix" (0.96-2)
both options "PQL" and "Laplace" for the method argument in lmer function gave me the same results (random and fixed effects
2008 Dec 06
1
Questions on the results from glmmPQL(MASS)
Dear Rusers,
I have used R,S-PLUS and SAS to analyze the sample data "bacteria" in
MASS package. Their results are listed below.
I have three questions, anybody can give me possible answers?
Q1:From the results, we see that R get 'NAs'for AIC,BIC and logLik, while
S-PLUS8.0 gave the exact values for them. Why? I had thought that R should
give the same results as SPLUS here.
2004 Nov 01
1
GLMM
Hello,
I have a problem concerning estimation of GLMM. I used methods from 3 different
packages (see program). I would expect similar results for glmm and glmmML. The
result differ in the estimated standard errors, however. I compared the results to
MASS, 4th ed., p. 297. The results from glmmML resemble the given result for
'Numerical integration', but glmm output differs. For the
2000 Jan 04
0
Stepwise logistic discrimination - II
I apologise for writing again about the problem with using stepAIC +
multinom, but I think the reason why I had it in the first place is
perhaps there may be a bug in either stepAIC or multinom.
Just to repeat the problem, I have 126 variables and 99 cases. I don't
know if the large number of variables could be the problem. Of couse the
reason for doing a stepwise method is to reduce this
2003 Jun 17
1
probability values ?
Hello
I try to find probability values of some predictor combinations using
logistic reg. in response level.
Firstly I found coefficients by glm function.
Then I followed two ways to get probability values:
1- probility <- exp(X0+bX1+cX2+...)/((1+exp(X0+bX1+cX2+...))
2- probility <- predict(glm.obj,type="resp")
Should have these two given same result ?
if so, I did not have. Why
2006 Feb 07
1
post-hoc comparisons following glmm
Dear R community,
I performed a generalized linear mixed model using glmmPQL (MASS
library) to analyse my data i.e : y is the response with a poisson
distribution, t and Trait are the independent variables which are
continuous and categorical (3 categories C, M and F) respectively, ind
is the random variable.
mydata<-glmmPQL(y~t+Trait,random=~1|ind,family=poisson,data=tab)
Do you think it
2005 Aug 18
1
GLMM - Am I trying the impossible?
Dear all,
I have tried to calculate a GLMM fit with lmer (lme4) and glmmPQL
(MASS), I also used glm for comparison.
I am getting very different results from different functions, and I
suspect that the problem is with our dataset rather than the functions,
but I would appreciate help in deciding whether my suspicions are right.
If indeed we are attempting the wrong type of analysis, some
2009 Oct 15
2
plotting/examining residuals of a mixed generalised linear model
Dear R users,
I'm hoping that more experienced users will be able to assist me in
examining the model fit of a mixed generalised linear model. The example
using the data 'bacteria' within the MASS package will hopefully illustrate
what I would like to acheive;
library(MASS)
library(nlme)
attach(bacteria) # y being output and the trt - treatment group being an
explanatory variable.
2006 Nov 15
1
dynamic aggregation of many variables
Hi,
i have many variables for in example 4weeks and want to do
aggregations, like mean standard , deviation etc..
With mean it works but how i can calculate the standard deviation for
the 4weeks and for every ID.
many thanks & regards, christian
week1 <- grep("(_PRO_001)",names(dmx3),perl=T)
week1table <- subset(dmx3,select=c(ID,week1))
week2 <-
2008 Dec 25
0
Class and object problem
Odette Gaston <odette.gaston <at> gmail.com> writes:
>
> Dear all,
>
> I have a problem with accessing class attributes.
> I was unable to solve this
> yet, but someone may know how to solve it.
My best guess at your immediate problem (doing
things by hand) is that you're not using the
whole vector. From your example:
Delta <- c(m1 = 0, m2 = 1.8, m3 =
2003 Mar 17
3
Error in file(file, "r")
Hello,
I am a new user of R, and I am not able to read/scan external files. I am
working in a Linux environment. I have read through the R FAQ and documents
and have not been successful using the recommendations. Below are several
scripts I've used and the error messages. .
I've cc'd Brandon Whitcher because it was recommended in another FAQ. I
read that this is a bug that
2007 Oct 11
1
creating summary functions for data frame
I have a data frame that looks like this:
> gctablechromonly[1:5,]
refseq geometry gccontent X60_origin X60_terminus length kingdom
1 NC_009484 cir 0.6799 1790000 773000 3389227 Bacteria
2 NC_009484 cir 0.6799 1790000 773000 3389227 Bacteria
3 NC_009484 cir 0.6799 1790000 773000 3389227 Bacteria
4 NC_009484 cir 0.6799
2004 Jun 14
1
glmmML package
I'm trying to use the glmmML package on a Windows machine. When I try to install the package, I get the message:
> {pkg <- select.list(sort(.packages(all.available = TRUE)))
+ if(nchar(pkg)) library(pkg, character.only=TRUE)}
Error in dyn.load(x, as.logical(local), as.logical(now)) :
unable to load shared library
2012 Sep 14
1
Adding annotations to qplot from a data frame
I have the following data frame:
> algaedata =
year DIV cellsperml
2001 BAC 72.808
2001 CHL 3.273
2002 BAC 14.002
2002 CYA 220.896
2002 UNI 464.699
2003 BAP 0
2003 BAC 1.782
2004 CYA 315.799
2005 UNI 222.532
2005 BAP 0.2
2005 CYA 163.627
2005 BAC 324.949
2006 CHL 1.636
2006 BAC 199.145
2007 CHL 19.635
2007 CYA 134.174
2007 BAC 485.405
2007 CHL 11.454
2007 CYA 104.721
...which makes a fine
2006 Aug 21
1
New version of glmmML
A new version, 0.65-1, of glmmML is now on CRAN. It is a major rewrite
of the inner structures, so frequent updates (bug fixes) may be
expected for some time.
News:
* The Laplace and adaptive Gauss-Hermite approximations to the log
likelihood function are fully implemented. The Laplace method is made
the default. It should give results you can compare to the results
from 'lmer' (for the
2006 Aug 21
1
New version of glmmML
A new version, 0.65-1, of glmmML is now on CRAN. It is a major rewrite
of the inner structures, so frequent updates (bug fixes) may be
expected for some time.
News:
* The Laplace and adaptive Gauss-Hermite approximations to the log
likelihood function are fully implemented. The Laplace method is made
the default. It should give results you can compare to the results
from 'lmer' (for the
2012 Oct 12
1
RTAQ - convert function: warning causes incorrect loading of data
Hello,
I am closely following the RTAQ documentation in order to load my dataset
into R, however I get this warning when running the convert function in the
following way:
convert(from="2010-11-01", to="2010-11-01",datasource=datasource,
datadestination=datadestination,trades=T,quotes=T,ticker="BAC",dir=T,
extention="csv", header=T,
2012 Jan 09
1
glmmPQL and predict
Is the labeling/naming of levels in the documentation for the
predict.glmmPQL function "backwards"? The documentation states "Level
values increase from outermost to innermost grouping, with level zero
corresponding to the population predictions". Taking the sample in
the documentation:
fit <- glmmPQL(y ~ trt + I(week > 2), random = ~1 | ID,
family =
2010 Jun 18
0
pcse package - is it OK to use it when my regression is weighted by each subgroup's mean
Hello!
Just would like to make sure I am not doing something wrong.
I am running an OLS regression. I have several subgroups in the data
set (locations) - and in each location I have weekly data for 2 years
- on my DV and on all predictors. Looks like this:
location week DV Predictor1 Predictor 2
location1 week1 xxx xxxxxxx xxxxxxxxx
location1 week2 xxx xxxxxxx xxxxxxxxx
.
.
2012 Mar 02
2
Why do my regular expressions require a double escape \\ to get a literal??
Hi,
I was recently misfortunate enough to have to use regular expressions to
sort out some data in R.
I'm working on a data file which contains taxonomical data of bacteria
in hierarchical order.
A sample of this file can be generated using:
tax.data <- read.table(header=F, con <- textConnection('
G9SS7BA01D15EC Bacteria(100) Cyanobacteria(84) unclassified
G9SS7BA01C9UIR