search for: coluimns

I have two data sets data1 and data2 with no column names( No header). The first coluimn in both data sets represents the case ID. How can I tell R to merge the two data sets by the case ID if there is no header? Also, In data1 I have more cases and I would like the result of the merge to have all the cases in both data1 and data2. there may be some duplicate cases. I appreciate if someone can

Hello, Consider this function for generalized ridge regression: gre <- function (X,y,D){ n <- dim(X)[1] p <- dim(X)[2] intercept <- rep(1, n) X <- cbind(intercept, X) X2D <- crossprod(X,X)+ D Xy <- crossprod(X,y) bth <- qr.solve(X2D, Xy) } # suppose X is an (nxp) design matrix and y is an (nx1) response vector p <- dim(x)[2] D<- diag(rep(1.5,p)) bt