On Jun 21, 2010, at 6:50 PM, CC wrote:
Hi all!
I am trying to extract output information from the survfit function
in order
to generate a matrix of select output for multiple factors.
Specifically, I am interested in extracting the number of events (in
the
output below: 106, 2, 3). The variable names represented in my
function
(ee) are shown below, but none of those variables correspond to the
column
of events as shown in the output.
What should I be using to call the number of events?
*******************
*Format of the Matrix:*
[,1] [,2] [,3] [,4] [,5] [6]
[7] [8]
[1,] "rs12082473_T" "2288" "2211" "21" "56" (Number of Events)
*******************
*CODE & Output:*
ee=survfit(Surv(dta$dmi,dta$mi==1)~dta[,i],data=dta)
Couldn't you just sum dta$mi==1 at this point? Perhaps with
complete.cases or na.omit surrounding an appropriate subset of
data.... untested in absence of reproducible example:
sum(dta[!is.na(dta[,i])]$mi==1)
See also:
https://stat.ethz.ch/pipermail/r-help/2010-June/242478.html
records n.max n.start *events* median 0.95LCL 0.95UCL
dta[, i]=0 2211 2211 2211 *106 * NA NA NA
dta[, i]=1 21 21 21 *2 * NA NA NA
dta[, i]=2 56 56 56 * 3* NA NA NA
*******************
*Variable Names*:
names(ee)
[1] "n" "time" "n.risk" "n.event" "n.censor" "surv"
[7] "type" "strata" "std.err" "upper" "lower"
"conf.type"
[13] "conf.int" "na.action" "call"
****************
Thanks!
CC
--
David Winsemius, MD
West Hartford, CT
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