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...velopment of liver cancer in cirrhotic patients. So dependant variable is binanry (cancer yes or no). Independant variables are biological data. The aim is to find out a cut-off value which differentiate (theoratically) from normal to pathological state for each biological data. How can I step in procedue to get a cut-off value (threshold) for each variable? I think I should try by ROC. But I'm not sure. If so, someone can lead me? If not, someone can advice me how ? Any advice will be cordially aprreciated. Tin Tin Htar Myint Research assistant Liver unit Jean Verdier Hospital, Bondy France

Dear all I am so glad the R can provide the efficient calculate about eigenvector and eigenvalue. However, i have some puzzle about the procedure of eigen. Fristly, what kind of procedue does the R utilize such that the eigen are obtained? For example, A=matrix(c(1,2,4,3),2,2) we can define the eigenvalue lamda, such as det | 1-lamda 4 | =0 | 2 3-lamda | then we can obtain the lamda=5 and -1 however, i am interesting in that how does the R to ob...

Dear experts, when trying to estimate an kernel density function with density(x) I get the following error message with imported data from either EXCEL or text files: Error in density(spr) : argument must be numeric. Other procedues such as truehist work. If I generate data within R density works fine. Does anybody have an idea? Yours -- Christoph Hanck Wissenschaftliche Hilfskraft Lehrstuhl f??r Empirische Wirtschaftsforschung, Prof. Dr. Wilfling http://www.wiwi.uni-muenster.de/~05/ WWU Muenster Tel.: +49-251-83 25043 eMai...

On Sun, Nov 07 2010 at 6:05pm -0500, Andi Kleen <andi@firstfloor.org> wrote: > On Sun, Nov 07, 2010 at 10:39:23PM +0100, Milan Broz wrote: > > On 11/07/2010 08:45 PM, Andi Kleen wrote: > > >> I read about barrier-problems and data getting to the partition when > > >> using dm-crypt and several layers so I don''t know if that could be > >