search for: ld98

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...

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

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 regarding the search path. I think I have fixed this problem. But, when I tried to run the program, it still opened up the MS-DOS Window and gave me another error message. If you have tried thi...

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_...

...> Message-ID: <467BC227.8000701 en vanderbilt.edu> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > Tomas Goicoa wrote: > > Hi R Users, > > > > I am trying to use the ldBand package. Together > > with the package, I have downloaded the ld98 > > program (version for windows) as indicated in the > > help page on ldBand. I did it, but obtained an > > error message "Error in (head + 1):length(w) : > > Argument NA/NaN" when I copied the help examples, > > so it seems that a conection between R and ld...