It is unusual. SPSS has had PCA under FACTOR since at least 1972. include the specification /extraction = PC or equivalently /extraction = PA1 on the FACTOR procedure.
I don't know if it can handle 11,000 variables. It is late and my memory is bad right now, but if you did a Q factoring instead of an R factoring it should execute a lot faster. If I recall correctly, Q and R factoring the same data matrix have equivalences. I just cannot remember what they are right now. 2 suggestions. 1) describe your problem more fully, perhaps there are other approaches to your research questions. 2) if you don't get enough help here try MPSYCH-L and CLASS-L where there are a lot of people with psychometric backgrounds Art [EMAIL PROTECTED] "Dr. V. Ravi" wrote: > Hi everyone: > > I am new to this group. I am working on a bioinformatics problem. I > need to perform PCA on a matrix of order 150x11000 - yes, the number > of variables far exceeds the number of samples. I tried using MATLAB, > which gives an error > maybe because of the size of the matrix. SPSS 11.0 does not contain > an explicit module for PCA. > > Pls tell me how to go about it. It is urgent! > > Thanks . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
