Hello, I was wondering if anyone has successfully implemented the non-metric pls regression algorithm presented by Giorgio Russolillo in the appendix of his PhD dissertation. I am having issues calling the function with his example matrices (tea data set) and I think there may be a few mistakes in the R-Code given in the appendix. The function is defined as: myPLSQQ(Y = NA, Yc = NA, X = NA, Xc = NA, ncomp) however nowhere does he specify what Xc and Yc refer to (I am assuming data containing the non metric variables). Furthermore, I do not understand how to call a function with arguments initialized to NA. Can I simply say: Y <- Y_Matrix Xc <- X_Matrix ncomp <- 3 data <- myPLSQQ(Y = Y, Yc = NA, X = NA, Xc = Xc, ncomp) Kind Regards, Chris -- View this message in context: http://r.789695.n4.nabble.com/PLS-Regression-Non-Metric-tp4711693.html Sent from the R help mailing list archive at Nabble.com.