Dear R users, I have a txt file named 'data_1.txt' whose first column contains the names of the individuals and the other columns contain the values of four variables X_1,X_2,X_3 and X_4. I read it with R from its location and called it data. I'd like to do a normalized principal component analysis. I started by calculating the correlation matrix: cor(data) I got the following message: Error in cor(nnotes) : 'x' must be numeric. I eliminated the first column of names, then read the modified data and then added the names of individuals with rownames. I was able to run PCA and obtain graphical representations of the variables, their coordinates, contributions and cos2. However, when I used fviz_pca_ind to get the graphical representation of the individuals, I got a graphic that considers the variables as individuals. Can you please help me? I have attached the file data_1 .txt file. Many thanks in advance. -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: data_1.txt URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20240223/039cec99/attachment.txt>