Hello，I am a Chinese student, and I got the same problem. I have learnd R for several weeks, I want to draw a PCA picture. I have data in excel format like this: ID d1 d2 d3 d4 A 1 2 3 4 B 1 2 3 4 C 1 2 3 4 D 1 2 3 4 E 1 2 3 4 How to load these data,and draw the PCA picture?
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