Hello, I would like to do a pca with princomp.
I have a dataset with different observations for each row and for different variables for each column (test.z). If I understood it correctly this is the way the data should be structured for princomp. But it does not work. But if I transpose the matrix (test.t - see below) it works. test.z[1:3,1:6] rs1291584 rs3737728 rs6687776 rs9651273 rs4970405 rs12726255 1 1.058438 3.175315 -3.704534 -3.439924 -2.116876 -2.381486 2 -6.879848 -4.762972 4.233753 -3.439924 -2.116876 -2.381486 3 -6.879848 -4.762972 4.233753 -3.439924 -2.116876 -2.381486 > prc <- princomp (test.z) Fehler in princomp.default(test.z) : 'princomp' kann nur mit mehr Einheiten als Variablen genutzt werden After tranposing the matrix - it works. Transposed matrix: > test.t <- t (test.z) > prc <- princomp (test.t) > prc Call: princomp(x = test.t) etc The error message might give the answer: I understand it like this: You need more obsvervations than variables. Does this make sense? Thanks for some hints hermann dput (test.z) structure(c(1.05843820744527, -6.87984834839428, -6.87984834839428, -6.87984834839428, 8.99672476328483, 8.99672476328483, -6.87984834839428, 8.99672476328483, -6.87984834839428, -6.87984834839428, 1.05843820744527, -6.87984834839428, 8.99672476328483, 1.05843820744527, 1.05843820744527, -6.87984834839428, -6.87984834839428, 8.99672476328483, 1.05843820744527, 8.99672476328483, 1.05843820744527, -6.87984834839428, 1.05843820744527, 1.05843820744527, 8.99672476328483, 1.05843820744527, 8.99672476328483, 1.05843820744527, -6.87984834839428, -6.87984834839428, 3.17531462233582, -4.76297193350373, -4.76297193350373, 3.17531462233582, -4.76297193350373, -4.76297193350373, 3.17531462233582, -4.76297193350373, 3.17531462233582, -4.76297193350373, -4.76297193350373, -4.76297193350373, 3.17531462233582, 3.17531462233582, 11.1136011781754, 3.17531462233582, -4.76297193350373, 11.1136011781754, -4.76297193350373, 3.17531462233582, -4.76297193350373, 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