Re : Kaplan Meier - confidence interval for the median

[phguardiol@aol.com]

HI,
Wouldnt it be more appropriate to summarize your data this way:
median + 1st quartile and 3rd or median + range (mini-maxi) ?

Phil


-----E-mail d'origine-----
De : Barker, Chris <Chris.Barker@cvt.com>
A : s-news@lists.biostat.wustl.edu
Envoyé le : Vendredi, 19 Septembre 2008 18:10
Sujet : [S] Kaplan Meier - confidence interval for the median





















 I'd like to find out whether or not the method, used in SPLUS,  for 
computing the confidence interval for the median of a Kaplan Meier 
estimate is the method of


Brookmeyer, Crowley, “A confidence Interval for the Median Survival 
Time”, Biometrics, 38, 29-41, 1982.



 Interestingly, for the simple dataset of , (10, 15, 23, 30, 35, 52, 
100+) (and + indicates censoring)

 SPLUS gives, the median and CI as 30 (15, NA), (R reports the upper 
limit as inf)



 while SAS gives 30 (15,52)




  Chris Barker, Ph.D.


Consulting Statistician


   CV Therapeutics