search for: ldbands

Has anyone tried to download Hmisc and used ldBands function for calculating Lan-Demets group sequential boundaries? The write-up in F.Harrell's website indicates that, besides downloading the package Hmisc, one needs to copy the progra ld98 from the University of Wisconsin website. As suggested, I did this but received another error message r...

All, I'm getting the same error message as that discussed in a previous post (Feb 3, 2006). The reply to that post was to insure that the ld98 program was in the system path (as also suggested in the help on ldBands). I have done this but this does not change the result. Any advice much appreciated. David > sessionInfo() R version 2.7.2 (2008-08-25) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC...

Hello My Fellow Users, Under the details it is given that the ld98 executable should be in a subdirectory that is in the system. Should ld98.exe be included under Hmisc (where it is stored) or under the lib subdirectory within Hmisc? I am getting the following error message: Error in (head + 1):length(w) : NA/NaN argument. Does this mean that I didn't store the ld98.exe in the right place

Hello R users, I am looking for R (or S) code related to group sequential or adaptive designs for clinical trials. (The most prominent examples are the designs of Pocock or O'Brien/Fleming, the alpha-spending function approach, or Fisher's combination test and the inverse normal method.) I am particularly interested in the calculation of the critical boundaries, the handling of spending

...ection between R and ld98 > > is not well performed in my computer. Did I put > > ld98.exe in the wrong place? If so, where should > > I put it? Thanks a lot in advance, > > > > > > Berta Iba?ez Beroiz > > Do you mean the Hmisc package? Do you mean the ldBands function? Did > you put ld98.exe in a place that is in your system path as specified in > the ldBands help file? And please read the posting guide referenced below. > > Frank > > > > > ______________________________________________ > > R-help en stat.math.ethz.ch...