Displaying 20 results from an estimated 2000 matches similar to: "missing package"
2007 May 01
7
logrank test
how do l programme the logrank test. l am trying to compare 2 survival curves
---------------------------------
[[alternative HTML version deleted]]
2007 May 16
2
creating different strata
hie
l would like to create about ten strata l have tried using
sample(c(1,2),1,replace=TRUE) but all l get is a vector of 1 and 2 if i change it to sample(c(1,10),1,replace=TRUE) it gives me a vector of 1 and 10 how do l go about it
---------------------------------
[[alternative HTML version deleted]]
2007 May 14
1
logrank
hie
is it possible to get the code for the logrank test l just need the chisquared value.
thanks
---------------------------------
[[alternative HTML version deleted]]
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.
2007 Apr 25
2
creating random numbers
l want to create a column of 1 and 2 randomly what command should l use
eg
treatment strata
1 1
2 0
1 1
2 1
2 0
2 1
2 0
1 0
these should be created randomly
secondly if l have
2007 Nov 13
3
cronbach's alpha
hie
1...i'm trying to carryout a relibility testusing cronbach's alpha what fuctin do i use.
2.. this is more of a statistical question.if the alpha value for all the variables is negative what does it mean. and if the alpha value is negative for all tyha variables but is greater than 0.7 for some sections of the variables what does that mean
thanks in advance
2007 May 07
2
computing logrank statistic/test
hie how do you compute the logrank test using R
what commands do you use my data looks something like just an example
treatmentgrp strata censoringTime survivalTime censoring act.surv.time
[1,] 2 2 42.89005 1847.3358 1 42.89005
[2,] 1 1 74.40379 440.3467 1 74.40379
[3,] 2 2
2007 Apr 26
3
adding a column to a matrix
i would like to add a variable to an existing matrix by manipulating 2 previous variables eg for the data
m
treat strata censti survTime
[1,] 1 2 284.684074 690.4961005
[2,] 1 1 172.764515 32.3990335
[3,] 1 1 2393.195400 24.6145279
[4,] 2 1 30.364771 8.0272267
[5,] 1 1 523.182282 554.7659501
l
2007 May 08
1
censoring
in R when carring out the log rank test is the censored variable denoted by 1 or 0 or its of no consequence.
thanks
---------------------------------
always stay connected to friends.
[[alternative HTML version deleted]]
2008 May 06
4
categorical data analysis
hie all
i am trying to carry out a categorical data analysis but my problem is that when in i use the chi squared test some of my expected values are less than 5. is there a test that can handle this situation. the data is not a 2*2 table. its more from the social sciences where you have from strongly agree to strongly disagree. i know i can collapse vthe tables but there is a loss of
2007 Oct 29
3
using survfit
hie
when i use plot.survfit to plot more than one graph why I only see the last graph how do i see the other graphs.for example
n=20
n1=n/2
n2=n/4
a11=4;a12=4 ;a21=4 ;a22=4
t1<-array(1,c(n1))
t2<-array(2,c(n1))
treatgrp=matrix(c(t1,t2))
2007 Oct 18
1
programming question
hie
i'm tryimg to generate two survival data using the following code (I know its ugly ) but it seems to repeat two of the variables can any one tell me whats the porblem.
n=20
n1=n/2
n2=n/4
a11=1 ;a12=1.4 ;a21=16 ;a22=a12 * a21
t1<-array(1,c(n1))
t2<-array(2,c(n1))
treatgrp=matrix(c(t1,t2))
2008 Dec 04
1
Comparing survival curves with "survdiff" "strata" help
ExpeRts,
I'm trying to compare three survival curves using the function "survdiff" in the survival package. Following is my code and corresponding error message.
> survdiff(Surv(st_months, status) ~ strata(BOR), data=mydata)
Error in survdiff(Surv(st_months, status) ~ strata(BOR), data = mydata) :
No groups to test
When I check the "strata" of the variable. I get .
2007 Jun 13
3
extractor rows from a matrix
hi!
i have a little problem: my data's matrix has 1093 rows and 3 columns.
i'd like to extract each rows..
something like this:
ht= my matrix
Dt=(???)=a vector with t=1,2...1093
what can i do?
thank you!
Vincenzo
--
View this message in context: http://www.nabble.com/extractor-rows-from-a-matrix-tf3913088.html#a11094459
Sent from the R help mailing list archive at Nabble.com.
2007 Mar 05
4
0 * NA = NA
Is there any way to "force" 0 * NA to be 0 instead of NA?
For example, suppose I have a vector with some valid values, while
other values are NA. If I matrix-pre-multiply this by a weight
row vector, whose weights that correspond to the NAs are zero,
the outcome will still be NA:
x <- c(1, NA, 1)
wt <- c(2, 0, 1)
wt %*% x # NA
Alberto Monteiro
2012 Oct 19
2
Question about survdiff in for-loop.
Hi everyone!!
I have dataset composed of a numbers of survival analyses.
( for batch survival analyses by using for-loop) .
Here are code !!
#######
dim(svsv)
Num_t<-dim(svsv)
Num<-Num_t[2] # These are predictors !!
names=colnames(svsv)
for (i in 1:Num )
{
name_tt=names[i]
survdiff(Surv(survival.m, survival) ~ names[i], data=svsv)
fit.Group<-survfit(Surv(survival.m, survival) ~
2007 May 16
3
Filled step-function?
Hello,
I'd like to generate a filled step-function in R as you can see in the
attachement (image is generated by grapher, but I need a freely
available alternative). The problem is, that I don't know, how to fill
it up. My code right now looks like this:
pH <- c(0,6.1,6.1,6.3,6.6,7.3,0)
Tiefe <- c(0,0,10,40,80,120,10)
plot(pH,Tiefe,type="s",main="Tiefenfunktion
2007 Oct 19
6
r achives
sorry but how do i accsess r archives
__________________________________________________
[[alternative HTML version deleted]]
2007 May 16
2
log rank test p value
How can I get the Log - Rank p value to be output?
The chi square value can be output, so I was thinking if I can also have the
degrees of freedom output I could generate the p value, but can't see how to
find df either.
> (survtest <- survdiff(Surv(time, cens) ~ group, data = surv,rho=0))
Call:
survdiff(formula = Surv(time, cens) ~ group, data = surv, rho = 0)
N Observed
2018 Feb 15
0
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