Dear Experts, Happy New Year!!, and thank you very much for all the assistance you rendered to me last year. I ran a PCA (Principal component analysis) and would like to combine PC1 and PC2 in order to define a new space. The variances associated with PC1 and PC2 are respectively 51% and 14%. The new space defined by PC1 and PC2 should result in the addition of the variances of the two PCs, i.e. 51%+14% = 65%. Some decision boundary lines/curves representing pth = 25%, 50%, 75% should also be added to the plot combining PC1 and PC2. I would be extremely happy to receive your help. The quires I tried to articulate above are indeed comments raised by one of the reviewers of my manuscript that recently returned for revision. The reviewer seems to have done such analysis and has sent me a copy of his/her paper where such analysis is presented in two plots. I would send the paper if anyone would like to take a look at it. Many thanks and warm regards Ogbos [[alternative HTML version deleted]]