[R] How to get CI from surfit object in survival

[Adrian Johnson]

Dear Bert,
thank you for suggestion.  I am aware of R-help function. I must
apologize, my earlier question could lead to assumptions otherwise.

As you can see below, I only get Std. error but not lower and Upper CIs.

I was wondering if there is another argument or method, could give CIs
which I cannot find anywhere.

Thanks
Adrian


> Nsurv <- survfit(Surv(NOSM,NStat)~as.factor(expcat1),conf.type='none',type='kaplan-meier')


> summary(Nsurv,time=c(12,24))
Call: survfit(formula = Surv(NOSM, NStat) ~ as.factor(expcat1),
    conf.type = "none", type = "kaplan-meier")

1 observation deleted due to missingness
                as.factor(expcat1)=DN
 time n.risk n.event survival std.err
   12     36      15    0.711  0.0629
   24     21       8    0.535  0.0722

                as.factor(expcat1)=UP
 time n.risk n.event survival std.err
   12     20       9    0.704  0.0833
   24      9       9    0.359  0.0931

> sessionInfo()
R version 3.2.3 (2015-12-10)
Platform: i386-w64-mingw32/i386 (32-bit)
Running under: Windows 8.1 x64 (build 9600)

locale:
[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
States.1252    LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] survival_2.39-5

loaded via a namespace (and not attached):
[1] Matrix_1.2-6    splines_3.2.3   grid_3.2.3      lattice_0.20-33

On Sat, Aug 26, 2017 at 7:24 PM, Bert Gunter <bgunter.4567 at gmail.com> wrote:
> ???
>
> Both ?survit.object (linked in the see also section of ?survfit) and
> ?summary.survfit give you this information. Do you not know how to use
> R's help faciities -- in which case you should learn them now; see
> ?help -- or have I misunderstood your query?
>
> Cheers,
> Bert
>
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along
> and sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
>
> On Sat, Aug 26, 2017 at 4:03 PM, Adrian Johnson
> <oriolebaltimore at gmail.com> wrote:
>> Hi
>> I am not sure hiw to get thr CI from summary function on the survfit object.
>> I can get the percent survival for 2 years from survfit object but I dont
>> get Confidence intervals
>> Could anyone suggest  a hint
>> Thanks
>> Adrian
>>
>>         [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.