Displaying 20 results from an estimated 1000 matches similar to: "pdMat class in LME to mimic SAS proc mixed group option? Group-specific random slopes"
2005 Sep 19
1
How to mimic pdMat of lme under lmer?
Dear members,
I would like to switch from nlme to lme4 and try to translate some of my
models that worked fine with lme.
I have problems with the pdMat classes.
Below a toy dataset with a fixed effect F and a random effect R. I gave
also 2 similar lme models.
The one containing pdLogChol (lme1) is easy to translate (as it is an
explicit notation of the default model)
The more parsimonious
2005 May 17
1
setting value arg of pdSymm() in nlme
Dear All,
I wish to model random effects that have known between-group covariance
structure using the lme() function from library nlme. However, I have yet
to get even a simple example to work. No doubt this is because I am
confusing my syntax, but I would appreciate any guidance as to how. I have
studied Pinheiro & Bates carefully (though it's always possible I've
missed
2010 Apr 14
3
pdMat
Alguien tiene experiencia en escribir una pdMat. Para aquellos que no lo
recuerden son las matrices de covarianzas de los efectos aleatorios que
ajusta la función lme de la librería nlme
Estas matrices tiene especial importancia en aplicaciones de genética de
poblaciones y en particular en mapeo de asociación. Pinheiro y Bates dicen
que el usuario puede crear sus propias pdMat y sugiere como
2003 Nov 25
1
using pdMAT in the lme function?
Hello. I want to specify a diagonal structure for the covariance matrix
of random effects in the lme() function.
Here is the call before I specify a diagonal structure:
> fit2<-lme(Ln.rgr~I(Ln.nar-log(0.0011)),data=meta.analysis,
+ random=~1+I(Ln.nar-log(0.0011)|STUDY.CODE,na.action=na.omit)
and this works fine. Now, I want to fix the covariance between the
between-groups slopes
2008 May 28
1
superposing barplots having different scales
Hello. I know how to make a bar plot in which a numeric y variable is
plotted against some grouping variable X (say, groups A, B, C) when this
grouping variable is subdivided into each of two subgroups; so the bars
would be: (group A subgroup 1) beside (group A subgroup 2), then (group B
subgroup 1) beside (group B subgroup 2), and so on. This is done using the
beside=TRUE argument in the
2004 Jul 12
2
lme unequal random-effects variances varIdent pdMat Pinheiro Bates nlme
How does one implement a likelihood-ratio test, to test whether the
variances of the random effects differ between two groups of subjects?
Suppose your data consist of repeated measures on subjects belonging to
two groups, say boys and girls, and you are fitting a linear mixed-effects
model for the response as a function of time. The within-subject errors
(residuals) have the same variance in
2010 Mar 26
4
Competing with SPSS and SAS: improving code that loops through rows (data manipulation)
Dear R-ers,
In my question there are no statistics involved - it's all about data
manipulation in R.
I am trying to write a code that should replace what's currently being
done in SAS and SPSS. Or, at least, I am trying to show to my
colleagues R is not much worse than SAS/SPSS for the task at hand.
I've written a code that works but it's too slow. Probably because
it's
2009 Mar 10
2
perform subgroup meta-analysis and create forest plot displaying subgroups
Hello,
I'm using the rmeta package to perform a meta analysis using summary statistics rather than raw data, and would like to analyze the effects in three different subgroups of my data. Furthermore, I'd like to plot this on one forest plot, with corresponding summary weighted averages of the effects displayed beneath each subgroup.
I am able to generate the subgroup analyses by simply
2013 Aug 27
0
lattice graph/ panel.superpose / groups
Hello,
?
I am struggling with a lattice graph.
I want to plot points and condition on a variable called 'Method'.
For each conditional plot I have two subgroups, say: 'first'and 'second'.
I want to plot the points in a conditional graph with a different color or symbol for each subgroup.
?
Moreover I want to calculate within each conditional graph limits of the points
2006 Jan 24
4
How to filter an activerecord find_all...
I have a nice hierarchical table structure like this:
divisions
has_many groups
groups
belongs_to division
has_many subgroups
subgroups
belongs_to group
has_many units
units
belongs_to subgroup
I have a report which is based on units, but i want to be able to filter
the units by which subgroup, or which group, or which division. I also
want to sort them by division.name,then group.name,
2011 Oct 10
1
Multiple imputation on subgroups
Dear R-users,
I want to multiple impute missing scores, but only for a few subgroups in my
data (variable 'subgroups': only impute for subgroups 2 and 3).
Does anyone knows how to do this in MICE?
This is my script for the multiple imputation:
imp <- mice(data, m=20, predictorMatrix=pred, post=post,
method=c("", "", "", "",
2012 Oct 29
2
naming datasubsets in a loop
Hello everbody,
I want to generate different subsets of my data-set and safe this
subsets with names listet in a vector. Because in reality I have got
about 70 subsets I want to realize this in a loop
Somehow like this:
names=c("nam1",
2012 Jul 13
2
Creating Subgroups in Puppet Dashboard
Hi All,
Is there a feasibility for creating subgroups on the Puppet Dashboard?
Basically the requirement is that we have a huge number of VMs running
designated services. Some of VMs having the same service may yet have
different properties configured on them. We are exploring the feasibility
of having these properties managed through puppet. Currently all these VMs
are put into a single
2009 Mar 25
2
"with" and "by" and NA:
Hi,
I have a data.frame with many variables for which I am performing the
mean by subgroup, for a pair of variables at a time, where one of them
for each pair defines the subgroup. The subgroups in the x$cm1 are 0, 1
and 2.
x
ph1 cm1
0.2345 2
1.2222 1
2.0033 0
0.0000 2
1.0033 1
0.2345 0
1.2222 2
2.0033 0
0.0000 1
1.0033 2
> meanbygroup <- as.vector(with(x, by(x$ph1, x$cm1, mean)))
2016 Oct 10
0
aVirtualTwins available on CRAN
[markdown format]
I'm glad to introduce you the new package aVirtualTwins. This package is an adaptation of VirtualTwins method of subgroup identification from [Foster, J. C., Taylor, J. M.G. and Ruberg, S. J. (2011)](http://onlinelibrary.wiley.com/doi/10.1002/sim.4322/abstract).
### Explanation
Virtual Twins has been created to find subgroup of patients in a random clinical trial with
2016 Oct 10
0
aVirtualTwins available on CRAN
[markdown format]
I'm glad to introduce you the new package aVirtualTwins. This package is an adaptation of VirtualTwins method of subgroup identification from [Foster, J. C., Taylor, J. M.G. and Ruberg, S. J. (2011)](http://onlinelibrary.wiley.com/doi/10.1002/sim.4322/abstract).
### Explanation
Virtual Twins has been created to find subgroup of patients in a random clinical trial with
2007 Jul 12
2
Metadata additions
With this mail I would like to make a proposal to add additional informations
to the core and plugin metadata files. Currently these tags are already
handled in the ccs configuration system. Ccs automatically adds this
informations to the core/plugin option set, but I think that it would make
more sense to add this to the official files, to allow similar features in
other configuration
2008 Aug 28
2
tree structure in rails?
Hi,
Is there is any way in ruby on rails where we show all my groups there
subgroups
with check boxes in tree structure way?
e.g
group A
|
----Group A.1
|
----Group A.2
|
---------Group A.2.1
All with check boxes and subgroup opens when click on root ?
--
Posted via
2012 Mar 29
3
How to get the most frequent value of the subgroup
Dear Members of the R-Help,
While using a R function - 'aggregate' that you developed, I become to have a question.
In that function,
> aggregate(x, by, FUN, ..., simplify = TRUE)
I was wondering about what type of FUN I should write if I want to get "the most frequent value of the subgroup" as a summary statistics of the subgroups.
I will appreciate if I can get
2010 Oct 14
1
Regression with groups and nested sub-groups
I have the following formula for a linear model:
z <- lm(y~x + factor(a) + factor(b), data=NT2010)
where a (groups) and b (Sub-groups) are categorical variables (factors), x
is a continuous covariate, and y the response variable. Since b is nested
within a, the formula can also be written as:
z <- lm(y~x + factor(a) + factor(a)/factor(b), data=NT2010)
and the same output is achieved