Hello Everyone,
Trying to help someone recover the contents of an SPSS.sav file using
read.spss. This seemed to work well but produced a warning message. My code and
the warning are displayed below.
Spent some time looking for previous questions about this warning. Found a lot
of questions
Hello Everyone,
Â
This is my first attempt to do something in R. As a precursor to a Willingness
to Pay analysis, I want to conduct a Mixed Conditional Logit analysis but am
unsure how to proceed because of some nesting within my data.
Â
Below is some data and code that illustrate what Iâm
Hello Everyone,
Below is some SAS code that uses a line hold specifier to read multiple
observations from each of several input lines of data. There are 3 patients per
line in the in-stream data.
Is there a way in R to read this kind of data? I've looked in my books and
online but haven't
A 1 111 F 69 70
Rather than use a textConnection, you would probably just use a file.
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Joshua Wiley
Sent: Friday, 30 July 2010 4:59 PM
To: Paul Miller
Cc: r-help@r
Hello Everyone,
I've been asked to check if there is a significant difference in the following:
Pre Post
Group A 15/19 14/19
Group B 14/19 10/19
My sense is that I need to perform McNemar's test on these data because
responses are correlated within
Hello Everyone,
I'm trying to conduct a couple of power analyses and was hoping someone might
be able to help. I want to estimate the sample size that would be necessary to
adequately power a couple of non-inferiority tests. The first would be a
log-rank test and the second would be a
Hello Everyone,
Just finished reading A Handbook of Statistical Analyses using R by Everitt and
Hothorn. I'll begin by saying that I quite liked the book. It's both little and
mighty in the sense that it's very compact but contains a tremendous amount of
useful material.
The last chapter of
Thanks to everyone who replied to my post. One person indicated that this
question treads on dangerous terrain. I had that sense too but really wanted
to know how many packages might not be free in the sense that they could be
used at no cost by everyone. I was a little disappointed to learn
Hello Everyone,
Learning about R and its wonderful array of functions. If it's not obvious, I
usually try to find out what a function stands for. I think this helps me
remember better.
One function that has me stumped is sink. Can anyone tell me if this stands
for something?
Thanks,
Hello Everyone,
My company purchased S-Plus before it was bought out by Tibco. My understanding
is that we own version 7.0 outright.
So far, I've been learning in R but thought I might also try working in S-Plus.
My understanding is that S-Plus has some useful extra features. Another
Hello Everyone,
Â
Iâm a SAS user who has recently become interested in sequential clinical
trials designs. Iâve discovered that the SASÂ based approaches for these
designs are either too costly or are âexperimental.â So now Iâm looking
for alternative software. Two programs that
Hello Everyone,
Can anyone show me how to use discrete choice data to estimate marginal
willingness to pay? I've searched for simple information or code on how to do
this but haven't found much.
The closest I've come is a paper titled Introduction to Choice Experiments
using R. The paper
Hello Everyone,
I have just started learning R and am in the process of figuring out what it
can and can't do. I must say I am very impressed with R so far and am amazed
that something this good can actually be free.
Recently, I finished reading R for SAS and SPSS Users and have begun
Hello Everyone,
At last count, I had 14 responses to my question. Thanks very much to everyone
who replied, for helping me to understand that R is in fact capable of making
publication quality tables and is very flexible in rendering these outputs. I'm
still working my way through some of the
Hello Everyone,
I'm still quite new to R and am having trouble reading SQL Server Tables using
RODBC. I've looked though the RODBC documentation as well as material I found
online and in the book Data Manipulation with R, but I just can't quite seem
to get things to work.
Right now, I have
Thanks to those who responded to my post about reading SQL server tables using
RODBC. Someone in our IT department sent me a link that contained the following
information:
SQL ODBC connection strings
Standard Security: br Driver={SQLServer};Server=Your_Server_Name;Database=
Hello Everyone,
Â
I am a newbie with about a month's worth of experience using R. I've just spent
a little time learning how to work with date values. Mostly, this has involved
converting text values into dates.
Â
So far, I've managed to figure out how to do this in R proper using as.Date.
Hi Paul, Jim, Dennis, and others,
I got RODBC and SQL Server to create a date variable in R (see below). I'm
pretty sure the commands I was issuing before were working but that I was
stripping off the date class every time I submitted the command fix(mydata).
So I kept getting the mistaken
Hello everyone,
I need to do a sample size calculation. The study two arms and two endpoints.
The two arms are two different cancer drugs and the two endpoints reflect
efficacy (based on progression free survival) and toxicity.
Until now, I have been trying to understand this in terms of a
Thanks for your reply Marc. I'll look into the information you sent.
It ocurred to me that I could have done a better job of describing what I'm
trying to do. It can be difficult to do that sometimes when your unfamiliar
with a topic and are still trying to figure it out yourself.
In
Hello All,
Recently, I discovered that there are appear to be some good R related books
that don't have R in the title. For example, I'm currently reading Gellman and
Hill's book Data Analysis using Regression and Multilevel/Hierarchical Models.
The book uses R (and BUGS) but doesn't appear
I can add one more title. The foundations of statistics: A simulation-based
approach by Vasishth and Broe.
Paul
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
Hello Everyone,
I'm learning how to perform various statistical analyses in R. I'm checking my
understanding by replicating examples from my SAS books. Below is an attempt to
replicate a Cox Proportional Hazards model with a time-varying covariate. I
think I'm doing this correctly but am not
Hi Terry and Kevin,
Â
Thanks for your replies to my post. And thanks particularly to Terry for
pointing out my confusion about the exact partial likelihood vs. the exact
marginal likelihood. I'm learning and so am likely to be confused about such
things from time to time.
Â
I had thought
Having trouble posting. Thought it might have something to do with the
particular message I'm sending. Sending this message to test that possibility.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the
Having trouble posting. This is a second test email to help determine if the
problem has been resolved.
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
Hello Everyone,
I need to perform a sample size calculation using a drop the loser/keep the
winner design. I've been searching for examples of how to do this using R but
haven't found much.
The most promising possibility thus far is an R function called DrpLsrNRst.
This appears in the book
Hello All,
Need to coalesce some columns using R. Looked online to see how this is done.
One approach appears to be to use ifelse. Also uncovered a coalesce function in
the BBmisc, emoa, and microbenchmark packages.
Trouble is I can't seem to get it to work in any of these packages. Or perhaps
Hi Michael,
So the coalesce functions don't do what I thought they did. I'll just use
ifelse() then unless anyone makes it clear I should do something different.
Thanks,
Paul
__
R-help@r-project.org mailing list
Hi Brian,
This works very well. Still trying to develop some skill with R. So can't say I
understand your function completely as yet, but will work on it. I had thought
that your function might only work for two columns (because of the
function(x,y) part), but the example below suggests it
Hello All,
I was wondering if it's possible to reshape data from long to wide in R without
using a timevar. I've pasted some sample data below along with some code. The
data are sorted by Subject and Drug. I want to transpose the Drug variable into
multiple columns in alphabetical order.
My
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received: Tuesday, March 20, 2012, 9:01 AM
If I understand you right,
library(reshape2)
dcast(melt(TestData, id.var = Subject, measure.var =
Drug), Subject ~ value)
Michael
On Tue, Mar 20, 2012 at 9:50 AM, Paul Miller
Hello All,
Tried some more Internet searches and came to the conclusion that one probably
does need to create a timevar before reshaping from long to wide. Below is
some code that creates the timevar and transposes the data.
connection - textConnection(
005 1 Gemcitabine
005 2 Erlotinib
006 1
Hello All,
Want very much to learn how to plot patient drug timelines. Trouble is I need
to figure out how to do this today. So not much time for me to struggle with
it. Hoping someone can just help me out a bit.
Below are some sample data and code that produces what I think is the beginning
them?
Thanks,
Paul
--- On Thu, 3/22/12, Bert Gunter gunter.ber...@gene.com wrote:
From: Bert Gunter gunter.ber...@gene.com
Subject: Re: [R] Plotting patient drug timelines using ggplot2 (or some other
means) -- Help!!!
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
patient drug timelines using ggplot2 (or some other
means) -- Help!!!
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received: Thursday, March 22, 2012, 12:55 PM
Inline:
On Thu, Mar 22, 2012 at 1:41 PM, Paul Miller pjmiller...@yahoo.com
wrote:
Hello All,
Want very much
michael.weyla...@gmail.com
Subject: Re: [R] Plotting patient drug timelines using ggplot2 (or some other
means) -- Help!!!
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received: Thursday, March 22, 2012, 4:11 PM
On Thu, Mar 22, 2012 at 4:47 PM, Paul
Miller pjmiller...@yahoo.com
Hi Michael,
This may be an ugly way of doing things but the title = unique(paste( ... bit
in the code below automates the code for pattern, patient, and line.
So now all I'd need is the looping part.
If good ways of automating the code for pattern, patient, and line or of doing
the looping
Hi Michael,
Added a little more to my code (see below). It now automatically sets the name
of the file. It also does a better job of spacing the text for pattern and
patient x line at the top of the graph.
I really like the way this looks now. I just need to figure out how to loop
through the
--- On Fri, 3/23/12, R. Michael Weylandt michael.weyla...@gmail.com wrote:
From: R. Michael Weylandt michael.weyla...@gmail.com
Subject: Re: [R] Plotting patient drug timelines using ggplot2 (or some other
means) -- Help!!!
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received
the last day or so.
Paul
--- On Fri, 3/23/12, R. Michael Weylandt michael.weyla...@gmail.com wrote:
From: R. Michael Weylandt michael.weyla...@gmail.com
Subject: Re: [R] Plotting patient drug timelines using ggplot2 (or some other
means) -- Help!!!
To: Paul Miller pjmiller...@yahoo.com
Cc
: David Winsemius dwinsem...@comcast.net
Subject: Re: [R] Plotting patient drug timelines using ggplot2 (or some other
means) -- Help!!!
To: Paul Miller pjmiller...@yahoo.com
Cc: R. Michael Weylandt michael.weyla...@gmail.com, Petr PIKAL
petr.pi...@precheza.cz, Bert Gunter gunter.ber...@gene.com
Hello All,
Figured out how to get the gaps in the bars when a drug stops and the starts
again (see below). Made the graph overlaid/superimposed/stacked and got the
desired result. Not sure this is how an expert would do it. But it's simple and
it works.
Paul
setwd(N:/Regimen
Hello All,
Recently developed the code below for graphing patterns of chemotherapy
administration. As someone just starting to use R in their work, I managed to
figure out some parts of the code but needed help with others.
setwd(N:/Regimen Coding/0906/Plots Test)
getwd()
TestData -
Hello Baptiste,
What you've done is very interesting. Went through and tried to understand all
the steps. Reminded me of studying languages in years gone by. Always found it
easier to read and understand a sentence than to construct a sentence of one's
own. This is particularly true when
Hi Baptiste,
Thanks for your help with this. Sorry for being slow to express my
appreciation. I had intended to put some more time into tweaking the graphs
before responding. Recently have been reading Hadley Wickham's ggplot2 book and
have also located some materials on the knitr package.
Hello Everyone,
I'm trying to use SAS to replicate some results obtained in R. I was wondering
if anyone call tell me the SAS equivalent of the code that appears below.
fm.glm.x - glm(resp ~ . - 1, data = as.data.frame(mm.x),
na.action = na.exclude, family = binomial(link = probit))
Subject: Re: [R] What is the SAS equivalent of this R glm() code?
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received: Friday, December 3, 2010, 3:55 PM
ummm...
This is an R list. Shouldn't you be posting this query on a SAS list?
-- Bert
(and why would you want to do this anyway
:
From: peter dalgaard pda...@gmail.com
Subject: Re: [R] What is the SAS equivalent of this R glm() code?
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received: Friday, December 3, 2010, 4:15 PM
On Dec 3, 2010, at 22:42 , Paul Miller wrote:
Hello Everyone,
I'm trying
Hello Everyone,
Been learning R over the past several months. Read several books and have
learned a great deal about data manipulation, statistical analysis, and
graphics.
Now I want to learn how to make nice looking documents and about literate
programming. My understanding is that R
Hello Everyone,
Thanks to all who replied to my earlier message. I got quite a few responses
and several suggestions about how to create nice looking documents that
incorporate output from R. It took some time to investigate these, and in some
ways I'm more perplexed than when I started.
Hello Everyone,
Does anyone have the R code for this book? I contacted the author about this
and was told that it used to be on the book's website, but that the publisher
had asked that it be taken down. I'm hoping that someone will have downloaded
the code when it was available, and that
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received: Thursday, December 16, 2010, 2:52 PM
Hello,
You can find the code here:
http://www.bio.ic.ac.uk/research/mjcraw/therbook/index.htm
Regards,
Carlos Ortega.
On Thu, Dec 16, 2010 at 9:31 PM, Paul Miller pjmiller
Hello Everyone,
Below is my first attempt at R programming. The code replicates example 5.1
from Common Statistical Methods for Clinical Research with SAS Examples. I was
hoping that people more experienced than myself would be willing to take a look
and let me know what I did well and what
Hi Gabor,
Thanks very much for your reply. I was hoping to ask a follow-up question. Can
you explain why it's better to use transform than to use within? The main
difference between the two functions seems to be that within allows one to use
variables created in a step (e.g., A and B) to
Hello All,
I've been reading books about R for awhile now and am in the process of
replicating the SAS analyses from an old report. I want to be sure that I can
do all the things I need to in R before using it in my daily work.
So far, I've managed to read in all my data and have done some
Hi Michael and David,
Thank you both for your reply to my question. Problem solved. I'm finding that
my level of success with R is a little uneven thus far. I'm sometimes surprised
by the things I can do, but then am even more surprised by the simple things I
struggle with.
Appreciate your
Hello Everyone,
I have a question about how best to check dates for entry errors. I recently
discovered that R will read the incorrectly entered date 11/23/21931 without
producing a warning or an error message at least under some circumstances.
as.Date(11/23/21931, format = %m/%d/%Y)
[1]
Hello Everyone,
Still new to R. Wrote some code that finds and prints invalid dates (see
below). This code works but I suspect it's not very good. If someone could show
me a better way, I'd greatly appreciate it.
Here is some information about what I'm trying to accomplish. My sense is that
], \n) }
Rui Barradas
Message: 53
Date: Tue, 24 Jan 2012 08:54:49 -0800 (PST)
From: Paul Miller pjmiller...@yahoo.com
To: r-help@r-project.org
Subject: [R] Checking for invalid dates: Code works but needs
improvement
Message-ID:
1327424089.1149.yahoomailclas...@web161604.mail.bf1.yahoo.com
for several arguments and (very) simple formating.
{ cat(Error: Invalid date values in, DateNames[[i]], \n,
TestDates[DateNames][[i]][TestDates$Invalid==1], \n) }
Rui Barradas
Message: 53
Date: Tue, 24 Jan 2012 08:54:49 -0800 (PST)
From: Paul Miller pjmiller...@yahoo.com
To: r-help@r
Hi Rui, Marc, and Gabor,
Thanks for your replies to my question. All were helpful and it was interesting
to see how different people approach various aspects of the same problem.
Spent some time this weekend looking at Rui's solution, which is certainly much
clearer than my own. Managed to
Hello Everyone,
I am familiar with the use of 2SLS to mimic SEM. I even used this approach once
to estimate a model with a latent interaction term.
Does anyone know how to extend this approach to nested data? I have cancer
patients with measures of cancer symptoms, functional impairment, and
Hi Marc,
That the code I wrote initially is over engineered is certainly possible. Of
course, Rui's solution is a reworking of that code. If starting from scratch,
Rui likely would have done something quite different. I focused on Rui's code
because it was complete and was a clear improvement
Hi David and Rui,
Sorry to be so slow in replying. Thank you both for pointing out that the
problem with my code was that I was using comparison operators on mixed data
types. This is something I'll have to be more careful about in the future.
In an earlier email, David talked about how R can
Hello All,
I have a question about measurement invariance in a multigroup SEM. I am of the
impression that one cannot test the equality of structural paths across groups
without demonstrating measurement invariance of latent factors first. At a
minimum, this would involve demonstrating that
Hello Everyone,
I'm learning to do survival analysis in R using a time-varying covariate. I've
managed to set up my data correctly using SAS and then to get the correct
result using R.
What I'd like help with is getting the data set up correctly in R without
having to resort to using SAS.
Hello All,
Have recently started learning Sweave and Knitr. Am now trying to learn
odfWeave as well. Things went pretty smoothly with Sweave and Knitr but I'm
having some trouble with odfWeave.
My understanding was that odfWeave should work in pretty much the same way as
Sweave. With
Kuhn mxk...@gmail.com
Subject: Re: [R] odfWeave: Trouble Getting the Package to Work
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org r-help@r-project.org
Received: Monday, February 18, 2013, 8:47 AM
That's not a reproducible example. There is no sessionInfo() and you omitted
code
Hi Max,
It works! Updating the odfWeave and xml software did the trick. Thanks very
much for your help.
Paul
[[alternative HTML version deleted]]
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do
Hello All,
Can anyone tell help me understand why the function below doesn't work and how
I can fix it? Below are some sample data, some code that works on individual
rows of the data, and my attempt to translate that code into a function. My
hope is to get the function working and then to
Hello Bert and Sarah,
Thank you for your replies. Helped me understand how people might perceive my
question and why they might not respond.
Spent some time learning about R's debugging tools this morning. Began to
realize why my function didn't work. My second argument was the name of a
Hi Sarah,
That I was making things too complicated doesn't surprise me. A skilled
programmer makes everything look easy I think. And someone who is still
learning does just the opposite.
Am going to spend some time now looking through your tweaks.
Thank you very much for your help.
Paul
Hello All,
Does anyone know where I can find information about how to do a power analysis
for Cox regression with a time-varying covariate using R or some other readily
available software? I've done some searching online but haven't found anything.
Thanks,
Paul
start out using the steps
you've listed and see where that takes me.
Paul
--- On Fri, 7/13/12, Greg Snow 538...@gmail.com wrote:
From: Greg Snow 538...@gmail.com
Subject: Re: [R] Power analysis for Cox regression with a time-varying covariate
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help
for Cox regression with a time-varying covariate
To: Marc Schwartz marc_schwa...@me.com, Greg Snow 538...@gmail.com,
r-help@r-project.org, Paul Miller pjmiller...@yahoo.com
Received: Wednesday, July 18, 2012, 8:24 AM
Marc gave the referencer for Schoenfeld's article. It's actually quite simple
Happy Friday Everyone,
Hope Friday afternoon doesn't turn out to be a terrible time to post a
question. I've been doing a little data mining of patient text medical records
as of late. I started out trying to predict whether or not cancer patients had
received KRAS mutation testing and did
Hello All,
Recently, I was asked to help out with an SEM cross-validation analysis.
Initially, the project was based on sample-splitting where half of cases were
randomly assigned to a training sample and half to a testing sample. Attempts
to replicate a model developed in the training sample
Hi Joshua,
Thanks for your very helpful reply. I took a look at your mediation tutorial,
MplusAutomation, and semutils. I may not need any of this for the current
project, but it was very interesting and I could imagine using it in the future.
I also looked at the Hastie, Tibshirani, Friedman
Hello All,
Hope people won't mind my posting a LaTeX question here. I know a lot of people
who use R are also using LaTeX. I'm in a bit of a rush to complete a document
and am having trouble with one aspect of the formatting.
I'm creating a list of tables using:
\listoftables
I also have
...@me.com wrote:
From: Marc Schwartz marc_schwa...@me.com
Subject: Re: [R] A LaTeX question -- Hope people won't mind
To: Paul Miller pjmiller...@yahoo.com
Cc: r-help@r-project.org
Received: Monday, August 20, 2012, 3:27 PM
On Aug 20, 2012, at 3:13 PM, Paul
Miller pjmiller...@yahoo.com
wrote
Hello All,
Am intested in using R to analyze censored cost data. Looks like I'd need to
estimate some means and associated variances. I've got a few papers describing
this. These talk about the use of re-weighted estimators (Lin), inverse
probability weighted estimators (Bang-Tsiatis),
Hi Steven,
Not sure if you want to understand regular expressions in general or just the
solution to your particular problem. If it's the former and you'd be willing to
read a book on the subject, I'd recommend Mastering Regular Expressions by
Jeffrey Friedl. I'm about halfway through now, and
Hello Everyone,
I've been learning to use R in my spare time over the past several months. I've
read about 7-8 books on the subject. Lately I've been testing what I've learned
by trying to replicate the analyses from some of my SAS books. This helps me
make sure I know how to use R properly
Hello Everyone,
Figured out one part of the code. Setting the reference level for a factor is
accomplished using the relevel funtion (pg. 383 of MASS; pg. 70 of Data
Manipulation with R):
gad$dosegrp - relevel(gad$dosegrp,3)
This works very well. Much better than using a format in SAS
Hi Josh,
Thanks for your reply. You're right about letting R's method dispatch system
choose the method for summary and inserting more spaces in the code. I was just
messing around with the code in the former case and forgot to change it back.
As far as not having enough whitespace goes, I've
Hello All,
Would like to be able to convert a matrix to a dataframe without losing an
assigned dimname.
Here is an example that should illustrate what I'm talking about.
tableData - state.x77[c(7, 38, 20, 46), c(7, 1, 8)]
names(dimnames(tableData)) - c(State, )
tableData
State Frost
Hi David, Gabor, Arun, and Rolf,
Thanks for your replies to my question. Very interesting and very helpful. I
particularly liked the one-line solutions proposed by David and Gabor. I had a
suspicion that this conversion could be done using only a minimal amount of
code.
For what I'm doing,
Hello All,
Am learning to create tables with n(%) formatting using R. Below is a working
example. I think this is not bad but wondered if there are better ways of doing
it. Although it can be quite humbling, seeing good code helps me assess my
progress as an R programmer.
Ultimately want to
Hello Dr. Murdoch,
Thanks for your reply. Your tables package is interesting. Spent some time
experimenting with it yesterday and it looks like something I can use.
The n(%) format seems to be the standard for what I'm doing. So I can't
directly use the output your package produces. It does
Hello All,
Learning to use the odfWeave package. I really like the package. It has good
documentation, makes some very nice looking tables, and seems to have lots of
options for customizing output.
There are a few things I'd like to do that don't seem to be covered in the
documentation
Hello All,
Below is some sample survival analysis code. I'd like to able to get the
results from print(gehan.surv) into a matrix or data frame, so I can manipulate
them and then create a table using odfWeave. Trouble is, I'm not quite sure how
make such a conversion using the results from a
Hi Marc,
Oh, yes. That is quite simple. Silly me for not recognizing this. Thanks very
much for your help.
Paul
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
Hi Milan and Max,
Thanks to each of you for your reply to my post. Thus far, I've managed to find
answers to some of the questions I asked initially.
I am now able to control the justification of the leftmost column in my tables,
as well as to add borders to the top and bottom. I also
Bouchet-Valat nalimi...@club.fr
Subject: Re: [R] odfWeave: Some questions about potential formatting options
To: Paul Miller pjmiller...@yahoo.com
Cc: Max Kuhn mxk...@gmail.com, r-help@r-project.org
Received: Wednesday, April 17, 2013, 11:17 AM
Le mardi 16 avril 2013 à 10:15 -0700, Paul Miller a écrit
Hello All,
Am having some trouble computing Type III SS in a Cox Regression using either
drop1 or Anova from the car package. Am hoping that people will take a look to
see if they can tell what's going on.
Here is my R code:
cox3grp - subset(survData,
Treatment %in% c(DC, DA, DO),
c(PTNO,
wrote:
From: Terry Therneau thern...@mayo.edu
Subject: Re: Trouble Computing Type III SS in a Cox Regression
To: r-help@r-project.org, Paul Miller pjmiller...@yahoo.com
Received: Wednesday, April 24, 2013, 5:55 PM
I should hope that there is trouble,
since type III is an undefined concept
III SS in a Cox Regression
To: Paul Miller pjmiller...@yahoo.com, r-help@R-project.org
Received: Thursday, April 25, 2013, 10:40 AM
You've missed the point of my earlier
post, which is that type III is not an answerable
question.
1. There are lots of ways to compare Cox
models, LRT
Hello All,
Am replicating in R an analysis I did earlier using SAS. See this as a test of
whether I'm ready to start using R in my day-to-day work.
Just finished replicating a Kaplan Meier analysis. Everything seems to work out
fine except for one thing. The 95% CI around my estimate for the
Hi Enrico,
Not sure how SAS builds the CI but I can look into it. The SAS documentation
does have a section on computational formulas at:
http://support.sas.com/documentation/cdl/en/statug/63033/HTML/default/viewer.htm#statug_lifetest_a000259.htm
Although I can't provide my dataset, I can
1 - 100 of 127 matches
Mail list logo
