Displaying 20 results from an estimated 2000 matches similar to: "specifying decimal places"
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 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
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2007 May 01
7
logrank test
how do l programme the logrank test. l am trying to compare 2 survival curves
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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 May 07
4
creating a new column
hie l would like to create a 6th column "actual surv time" from the following data
the condition being
if censoringTime>survivaltime then actual survtime =survival time
else actual survtime =censoring time
the code l used to create the data is
s=2
while(s!=0){ n=20
m<-matrix(nrow=n,ncol=4)
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 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 May 17
2
controling the size of vectors in a matrix
hie R users
l have the following matrix
n=20
m<-matrix(nrow=n,ncol=4)
colnames(m)=c("treatmentgrp","strata","survivalTime")
for(i in 1:n) m[i,]<-c(sample(c(1,2),1,replace=TRUE),sample(c(1:2),1,replace=TRUE),rexp(1,0.07),rexp(1,0.02))
2007 May 14
1
logrank
hie
is it possible to get the code for the logrank test l just need the chisquared value.
thanks
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2012 Jul 09
1
Package DAAG
Hie
I am trying to install Package DAAG this is the error I get
> library(DAAG)
Loading required package: randomForest
Error: package 'randomForest' could not be loaded
In addition: Warning message:
In library(pkg, character.only = TRUE, logical.return = TRUE, lib.loc = lib.loc) :
there is no package called 'randomForest'
what should i do
thanks
The University of Fort Hare
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 02
2
missing package
l'm trying to find the "survdiff" package/function but it seems i cant get it how do l instal it if its not there
thanks
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2007 Oct 19
6
r achives
sorry but how do i accsess r archives
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2007 Apr 19
4
convergence
hie..
how can i write a loop that makes algorithm keeps repeating until a solution
is converged?do i use a for loop? i know that we can use for loop to ask for
a number of repetitions, but how to use it to ask the algorithm to keep
repeating until a solution is converged?
Thanks
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2013 Mar 15
1
numerics from a factor
A problem has been pointed out by a French user of the survival package and I'm looking
for a pointer.
> options(OutDec= ",")
> fit <- survfit(Surv(1:6 /2) ~ 1)
> fit$time
[1] NA 1 NA 2 NA 3
A year or two ago some test cases that broke survfit were presented to me. The heart of
the problem was numbers that were almost identical, where table(x) and unique(x) gave
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 Apr 19
1
Random number generator in R compared
I am trying to generate survival data using R .Im trying to randomly generate a column of 1s and 0 and another column randomly generated using an exponential distribution but l cant seem to get the random function. how do l go about it
thanks in advance
rt chiruka
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2005 Mar 30
2
Re:Plotting to A4 and replacing x-axis with actual years.
Hie,
I have written before and probably missed the reply.
1.) I have my figures in a 3X3 array and want to fit them onto a A4 size
page. I have written commands to try a represent them in eps format but
still their cutting out information.
2.) I have an odd number of years and wanted to represent them say 1980 1985
1990 1995 2000 instead of 1 5 10 etc. However, the years are not
overwritting in
2014 Aug 05
1
reset CentOS-7 lost root password
Hie
I lost my CentOS 7 root password, so I tried booting the OS in single user
mode but it prompts me for the root password when the system boots,
Any ideas?
Regards
Bonnie