hello R_team having perfomed a PCA on my fitted model with the function: data<- na.omit(dataset) data.pca<-prcomp(data,scale =TRUE), I´ve decided to aggregate two variables that are highly correlated. My first question is: How can I combine the two variables into one new predictor? and secondly: How can I predict with the newly created variable in a new dataset? Guess I need the "predict" and "new data" command but I´m having problems with the syntax and the help function was not sufficient on this issue. many thanks in advance Christian [[alternative HTML version deleted]]