Dear members, I am doing a survival analysis wiith the function coxph...however I am wondering how can I know if my data follows a EXPONENTIAL or WEIBULL distribution? I have 3 censored datum. Using R studio. Thanks for the suggestions, Xavier
As a start you can use an exploratory approach. Standard survival analysis texts show you how to use a log-log plot to assess whether a distribution is Weibull. Of course, the exponential is a special case of the Weibull. CHIRIBOGA Xavier <xavier.chiriboga at unine.ch> Sent by: "R-help" <r-help-bounces at r-project.org> 04/03/2015 10:33 AM To "r-help at r-project.org" <r-help at r-project.org>, cc Subject [R] WEIBULL or EXPONENTIAL? Dear members, I am doing a survival analysis wiith the function coxph...however I am wondering how can I know if my data follows a EXPONENTIAL or WEIBULL distribution? I have 3 censored datum. Using R studio. Thanks for the suggestions, Xavier ______________________________________________ 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. [[alternative HTML version deleted]]
Hi Xavier, I use the fitdistrplus and logspline packages to know which distribution fits better my data. Here is an example : install.packages("fitdistrplus") library(fitdistrplus) instal.packages("logspline") library(logspline) x=c(44986,18288,56147,44488,41018,40631,27301,39025,45688,47172,12300,21558,16103,48874,67245,36119,10398,42630,12879,34058,84443,30639) descdist(x,discrete=FALSE) Cheers, S. ________________________________ De : CHIRIBOGA Xavier <xavier.chiriboga at unine.ch> ? : "r-help at r-project.org" <r-help at r-project.org> Envoy? le : Vendredi 3 avril 2015 16h33 Objet : [R] WEIBULL or EXPONENTIAL? Dear members, I am doing a survival analysis wiith the function coxph...however I am wondering how can I know if my data follows a EXPONENTIAL or WEIBULL distribution? I have 3 censored datum. Using R studio. Thanks for the suggestions, Xavier ______________________________________________ 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.