The 10% rule does not provide a unique answer. Should it apply to the cumulative probability, its logarithm, or log-log (log hazard scale)? Many studies are too small to achieve 10% at any time point. I think it is more traditional (but not without bias) to stop where fewer than 10 subjects are still being followed. There's room for many other choices though. Sometimes I think that the curve should go to the max but be accompanied by confidence bands. Frank
Paul Johnston wrote > > What is the best way to report the standard error when publishing > Kaplan-Meier plots? In my field (Vascular Surgery), practitioners > loosely refer to the "10% error" cutoff as the point at which to stop > drawing the KM curve. I am interpreting this as the *standard error > of the cumulative hazard*, although I'm having a difficult time > finding some guidelines about this (perhaps I am not searching the > correct terms or references). My KM figures contain typically two > curves that I am comparing using the logrank test. Inspecting the > ?survfit.object yields the std.err field that gives the standard error > for each timepoint on the curve. > > Is it recommended that I just name the timepoint at which the standard > error exceeds 0.1 in the figure legend? For example, "The standard > error exceeds 10% at time points beyond 394 days." I have seen this > strategy in other publications. > > What is your approach? > > Thanks for your help, > PCJ > > ______________________________________________ > R-help@ mailing list > 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. > ----- Frank Harrell Department of Biostatistics, Vanderbilt University -- View this message in context: http://r.789695.n4.nabble.com/Reporting-Kaplan-Meier-Cox-Proportional-Hazard-Standard-Error-km-coxph-plot-survfit-object-tp4403045p4404200.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list 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.