Displaying 20 results from an estimated 378 matches similar to: "Comparing survival curves with "survdiff" "strata" help"

2012 Oct 18

1

looping survdiff?

Hello,
I am trying to set up a loop that can run the survdiff function with the
ultimate goal to generate a csv file with the p-values reported. However,
whenever I try a loop I get an error such as "invalid type (list) for
variable ''survival_data_variables[i]".
This is a subset of my data:
structure(list(time = c(1.51666666666667, 72, 72, 25.7833333333333,
72, 72, 72, 72,

2012 Oct 19

1

Looping survdiff

The number of recent questions from umn.edu makes me wonder if there''s homework involved....
Simpler for your example is to use get and subset.
dat <- structure(..... as found below
var.to.test <- names(dat)[4:6] #variables of interest
nvar <- length(var.to.test)
chisq <- double(nvar)
for (i in 1:nvar) {
tfit <- survdiff(Surv(time, completion==2) ~

2007 Apr 26

2

Extract p-value from survdiff function

Hi list,
I want to use the p-value from the survdiff function (package
survival) to reuse within a function in a Kaplan-Meier plot. The
p-value is somehow not a component of the value list ?!
Thanks in advance
--
A. Goralczyk
G?ttingen, Ger.

2005 Nov 23

1

survdiff for Left-truncated and right-censored data

dear all,
I would like to know whether survdiff and survReg function in the
survival package work for left-truncated and right-censored data.
If not, what other functions can i use to make comparison between two
survival curves with LTRC data.
thanks for any help given
sing yee

2009 Aug 03

2

survdiff for left-truncated data?

Hi
Does anyone know if there is a function like survdiff which can also handle
left-truncated and right-censored data? When I use it on left-truncated and
right-censored data I get an error message saying Right censored data only.
Many thanks
Rajen
[[alternative HTML version deleted]]

2004 Aug 17

2

survdiff

Hello,
As I am quitte an ignorant user of R, excuse me for any wrongfull usage of
all the terms.
My question relates to the statistics behind the survdiff function in the
package survival.
My textbook knowledge of the logrank test tells me that if I want to compare
two survival curves, I have to take the sum of the factors: (O-E)^2/E of
both groups, which will give me the Chisq.
If I

2004 Sep 28

4

Validating a Cox model on an external set

Good morning,
Sorry to trouble the list.
I have a problem I hope to seek your advice on.
Essentially, I am trying to ''validate'' a multivariate Cox proportional
hazards model built in a training set, by testing it on an external
test set. I have performed a survfit using the Cox model to predict
survival for the test set, and obtained individual predictions for
survival

2007 Feb 09

3

Re: URL issues

hello...
On 2/8/07, cdvr <codecraig-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Hi,
> I watched the rails screencast on creating a blog in 15 minutes.
> I followed along got it working on my home PC and I then uploaded it
> to my web host. So I have,
>
> /home/<username>/blog
>
> I had to change some config in the blog app

2018 Feb 15

1

Fleming-Harrington weighted log rank test

> On Feb 13, 2018, at 4:02 PM, array chip via R-help <r-help at r-project.org> wrote:
>
> Hi all,
>
> The survdiff() from survival package has an argument "rho" that implements Fleming-Harrington weighted long rank test.
>
> But according to several sources including "survminer" package

2018 Feb 15

1

Fleming-Harrington weighted log rank test

> On Feb 14, 2018, at 5:26 PM, David Winsemius <dwinsemius at comcast.net> wrote:
>
>>
>> On Feb 13, 2018, at 4:02 PM, array chip via R-help <r-help at r-project.org> wrote:
>>
>> Hi all,
>>
>> The survdiff() from survival package has an argument "rho" that implements Fleming-Harrington weighted long rank test.
>>

2018 Feb 14

1

Fleming-Harrington weighted log rank test

Hi all,?
The survdiff() from survival package has an argument "rho" that implements Fleming-Harrington weighted long rank test.?
But according to several sources including "survminer" package (https://cran.r-project.org/web/packages/survminer/vignettes/Specifiying_weights_in_log-rank_comparisons.html), Fleming-Harrington weighted log-rank test

2012 Jan 10

1

Lapack routine dgesv: system is exactly singular

Hi
I have a problem with this error, I have searched the archives and found
previous discussion about this, can I cannot understand how the explanations
apply to what I am trying to do.
I am trying to do Log_rank Survival analysis, I have included tables and str
command, is it a factor/integer problem? If so how do I correct this, as all
my attempt to recode the data have failed.

2006 Feb 21

4

rekord id-je .create után

Hali!
Mi a legegyszer?bb m?dja annak, hogy egy pl. note = Notes.create(...)
ut?n megkapjam az adott note ActiveRecord id-j?t (primary key)? Sajnos
ez ugye 0, mivel frissen lett l?trehozva...
?tlet?
G?bor

2002 Oct 11

1

automatic chi-square grouping in R

I''m doing some chi-square tests, and I recall some arbitrary rule that says each band must have at least 5 events in order for the test to be meaningful. Is there some way to do the banding automagically in R ? For instance, in the following survdiff, I''m trying to see if ADL affects survival. But when ADL=3,5 and 6, the number observed is too little. Anyway for me to tell R how

2003 Jul 14

2

install problem

Dear R experts,
I am in transition to the R system from other statistical systems I was
using (SPSS, Statistica, etc.). I have used R for a few months on my
Windows PC, but now I would like to install R on a Linux box with SuSE 8.1.
I downloaded the RPM for SuSE 8.1 from the CRAN mirror.
But when I run the INSTALL script using the midnight commander it gives
the following error message:
#

2006 Mar 16

1

include once in partials

Hi!
I have to include javascript code into my partial but I should do it
once. How can I do that?
What is the rule of thumb?
G?bor

2006 Mar 08

5

@params["aKey"] and multiple aKeys in request

Hi,
I''ve actually run into an interesting problem and no idea how to fix
it. In request parameters i have multiple "url" keys like this:
url=www.abc.com&url=cnn.com&url=....
But @params[:url] has only the latest value for "url" key instead of
having values kept in array.
So what''s next? Is there way out of this issue?
Thanks,
G?bor
PS.: I use rails

2008 Apr 09

3

How to estimate a hazard ratio using an external hazard function

Hi,
I would like to compare the hazard functions of two samples using the
Cox proportional hazards model. For sample 1 I have individual time-to-
event data. For sample 2 I don''t have individual data, but grouped
data that allows to obtain a hazard function.
I am wondering if there is an R function that allows to obtain a
hazard ratio of the two hazard funtions (under the

2005 Aug 28

11

stratified Wilcoxon available?

Dear All,
is there a stratified version of the Wilcoxon test (also known as van
Elteren test) available in R?
I could find it in the survdiff function of the survival package for
censored data. I think, it should be possible to use this function creating
a dummy censoring indicator and setting it to not censored, but may be
there is a better way to perform the test.
Thanks,
Heinz T??chler

2006 Mar 16

1

include once in partial

Hi!
I have to include javascript code into my partial but I should do it
once. How can I do that?
What is the rule of thumb?
G?bor