Thank very much all of you who gave invlauable suggestions and links to papers. It is pretty common in almost all bioinformatics problems that the number of variables swamp the number of samples. Hence, I wanted to perform feature selection by selecting the first few PCs before going for further studies. My student has used the 'snap shot method' of L. Sirovich, contained in MATLAB. I wanted to have a theoritical justification of what he had done. However, the other mehods suggested by the scholars in this forum do certainly enhance my understanding of the problem and the possible solutions.
thanking you all once again, v.ravi Gottfried Helms <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > Paige Miller schrieb: > >... > > I am wondering if you have tried the NIPALS algorithm, and how it > > compares (both in terms of accuracy and in terms of computer resources > > and time used) to the algorithm you describe. The NIPALS algorithm gives > > Paige - > > this sounds interesting. But besides of following your references - is > it possible to give a short insight in the principle of this NIPALS-algorithm? > > Gottfried > > -- > Gottfried Helms > Univ. Kassel > . > . > . > . > . > . > > . > . > . > > . > . > . > > . > . > . > > - . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
