Thank you Dr. David.
I try to summarize it.
Assumes x and z are two covariates:
x = dummy variable (1 or 0)
z = factors (people name)
x*z = x + z + x*z
therefore this is not a 2nd-order interactions, it should be (for an
exponential survival regression):-
h(t|(X=x,Z=z)) = exp(Beta0 + XZBeta1)
#-
Hi Carlos,
Here is one option:
## read in your data
dat <- read.table(textConnection("
obs unithome zsex age
1 015029 18 11 053
2 015029 18 12 049
3 015029 01 11 038
4
Hi all,
I've searched everywhere to try to find out how to do this and have had no
luck. I am trying to construct identifiers for couples in a dataset.
Essentially, I want to identify couples using more than one column as
identifiers. Take for instance:
obs unithome zsex
Dear Mr. Baddeley
I just graduated from a Masters in Applied Mathematics on Jun19th. My thesis
was about spatial distribution /a nalysis of some trees in a part of the Congo
Basic Forest.
In my thesis I used your spatial package in R, and today I'm doing a more
deeper study about how we chois
On Nov 12, 2011, at 6:04 PM, Giovanni Azua wrote:
Hello,
I have a loop where I iterate performance data files within a
folder, parse and plot them in one shot (see below).
However, when executing plot_raw which invokes dev.new(..) all
windows come out blank whereas if I execute each file
On Nov 12, 2011, at 6:40 PM, Sammy Zee wrote:
Thanks David. Besides rbind(), is there any other way to add a row
to a data frame so that I do not lose the custom attributes.
I have already told you the method that I know of. You don't seem to
have taken my poin that it is not a data.frame
Dear Contributors,
I am trying to perform a simulation over sample data,
but I need to reproduce the same simulation over 4 groups of data. My
ability with for loop is null, in particular related
to dimensions as I always get, no matter what I try,
"number of items to replace is not a multiple
Unfortunately, I couldn't find neither this source file, nor function wmax().
Was it any old version of strucchange? There are only files strucchange.R,
strucchange.rdb and strucchange.rdx in directory \strucchange\R.
Best,
Julia
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Hello,
I have a loop where I iterate performance data files within a folder, parse and
plot them in one shot (see below).
However, when executing plot_raw which invokes dev.new(..) all windows come out
blank whereas if I execute each file outside of a loop then I can see the plots
properly. Wh
Thanks David. Besides rbind(), is there any other way to add a row to a
data frame so that I do not lose the custom attributes.
Thanks,
Sammy
On Sat, Nov 12, 2011 at 5:17 PM, David Winsemius wrote:
>
> On Nov 12, 2011, at 2:47 PM, Sammy Zee wrote:
>
> When I use rbind() or rbind.data.frame() to
On Nov 12, 2011, at 7:37 AM, ryusuke wrote:
Hi experts,
http://r.789695.n4.nabble.com/file/n4034318/Parametric_survival_analysis_2nd-order_efffect.JPG
Parametric_survival_analysis_2nd-order_efffect.JPG
As we know a normal survival regression is the equation (1)
Well, I'ld like to modify it to
On Nov 12, 2011, at 2:47 PM, Sammy Zee wrote:
When I use rbind() or rbind.data.frame() to add a row to an existing
dataframe, it appears that attributes for the column of type
"factor" are
dropped. See the sample example below to reproduce the problem. Please
suggest How I can fix this.
It's on CRAN, where you can also see the record of updates:
http://cran.r-project.org/web/packages/MASS/index.html
Specifically, http://cran.r-project.org/web/packages/MASS/NEWS
Hope this helps
On Sat, Nov 12, 2011 at 8:55 AM, Xu Wang wrote:
> Does anyone know where I can find a changelog for M
firstly - it looks like you define orgDir but then your code later refers to
indexDir? that being said, I don't think that is relevant.
You could always try upgrading to the latest version and see if the problem
goes away (if you're not already).
I can't replicate the issue here but we can't gues
Does anyone know where I can find a changelog for MASS?
It's difficult to know whether I should ask my company to update the package
or not. We are usually required to show the changelog, but I can't find one.
Thank you,
Xu
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Dear all:
I could not able to find rcmd using the following path: either R version
(2.13.2 or 2.14.0); either rtools version (2.13 or 2.14). My os is winxp.
The variables set in path are as follows.
c:\Rtools\bin;c:\Rtools\MinGW\bin;C:\Perl\bin; C:\Perl\site\bin;
c:\Rtools\bin; C:\Program Files
When I use rbind() or rbind.data.frame() to add a row to an existing
dataframe, it appears that attributes for the column of type "factor" are
dropped. See the sample example below to reproduce the problem. Please
suggest How I can fix this.
Thanks,
Sammy
a=c("Male", "Male", "Female", "Male")
b=c
Hi Annie,
The error is in the R script...you start reading with Args[1] but instead
you should start with Args[5] etc. because (I believe) that R --slave
--vanilla --args count as
[1] [2][3][4]
Therefore, Args[5] it's the first argument you use...
On Sat, Nov 12, 2011 at 10:50 AM, Yackov Lubarsky wrote:
> Hi,
>
> I would like to plot a x,y curve described by the equation :
>
> Ax^2 + Bx + Cy^2 + Dy + E == 0
>
> (A,B,C,D,E are constants)
>
> This sounds like quite the common task but haven't been able to figure
> out how to do this. Could yo
On 11-11-12 5:50 AM, Yackov Lubarsky wrote:
Hi,
I would like to plot a x,y curve described by the equation :
Ax^2 + Bx + Cy^2 + Dy + E == 0
(A,B,C,D,E are constants)
This sounds like quite the common task but haven't been able to figure
out how to do this. Could you please help ? I am new to
arunkumar gmail.com> writes:
>
> Hi
>
> can we perform logistic regression using lmer function. Please help me with
> this
>
Yes.
library(lme4)
glmer([reponse]~[fixed effects (covariates)]+(1|[grouping variable]),
data=[data frame], family=binomial)
Further questions on this
Hi,
I'm trying to estimate the parameters of a state space model of the
following form
measurement eq:
z_t = a + b*y_t + eps_t
transition eq
y_t+h = (I -exp(-hL))theta + exp(-hL)y_t+ eta_{t+h}.
The problem is that the distribution of the innovations of the transition
equation depend on the pr
Two problems with your post:
a) you used a format that is not accepted by the mail server and
resulted in all of your linefeeds being removed, so it is now
basically unreadable. As the Posting Guide says, please use plain
text. (And please read the Posting Guide for yourself ... and do it
Hi,
I have some hydrochemical data from observation stations of a river
network. The data set provides information about the river hierarchy, i.e.
the order of the rivers (main river is 1st order, contributing is 2nd
order, and contributing to 2nd is 3rd order... etc).
Now I would like to use the
Hi,
On Sat, Nov 12, 2011 at 2:04 AM, Vinny Moriarty wrote:
> I'm trying out a basic plot, but something about the way I subset my data
> leads to problems with the plot.
>
>
> Here is the first bit of my data set
>
> year,date,location,quadrat_juvenile,photo_location,photo_exists,genus,count,dive
HiI want to construct a logliikelood function in RHere is the situationy=number
of particles emitted in 1 hr period~pois(30)p=probability of detection of
radiation particlesx=number of particles detected by a radiation
detector~pois(30p)where p~beta(a,1)I have to calculate the loglikehood for a
Hi
can we perform logistic regression using lmer function. Please help me with
this
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Hi experts,
http://r.789695.n4.nabble.com/file/n4034318/Parametric_survival_analysis_2nd-order_efffect.JPG
Parametric_survival_analysis_2nd-order_efffect.JPG
As we know a normal survival regression is the equation (1)
Well, I'ld like to modify it to be 2nd-order interaction model as shown in
equa
Hi,
I would like to plot a x,y curve described by the equation :
Ax^2 + Bx + Cy^2 + Dy + E == 0
(A,B,C,D,E are constants)
This sounds like quite the common task but haven't been able to figure
out how to do this. Could you please help ? I am new to R so probably
missing something basic.
Thanks
Supreet kaur [ksupre...@gmail.com]
> how do I calculate the reliability between the two groups
> using the ICCs?
Looking for the irr (inter-rater reliability package) might help; as the name
suggests, it includes a variety of measures of rater reliabilit
Thanks for your suggestion, Dimitris.
I know (and use) all of these R packages for IRT (I am actually writer of
one of them, EstCRM). I also use specialized commercial software such as
BILOG and MULTILOG.
My goal is to be able to estimate IRT model parameters in a nonlinear mixed
effects regressi
You've been told how to do what you ask.
But I'm not convinced that you really
want to do what you asked.
It might be better to do whatever you
want with the data leaving it all in one
object. There are many ways of doing that,
the 'by' function is one of them.
On 11/11/2011 20:24, Francesca wr
Note that there are several IRT dedicated packages in R, such as the ltm
and eRm packages. For more info you may check the Psychometrics Task
View at: http://cran.r-project.org/web/views/Psychometrics.html
I hope it helps.
Best,
Dimitris
On 11/11/2011 9:38 PM, Cengiz Zopluoğlu wrote:
Hi,
Thanks to all that responded privately!
If you have AVG and needs the colorspace (or ggplot2) package do the
following from a suitably privileged account:
1) Open AVG gui and select Components->Anti virus from the menu
2) Click "Advanced settings..." and then go to "Temporary disable AVG
prote
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