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...hadow 0 1 1 1 1 1 1 1 0 1 1 1 1 0 1 0 1 0 1 1 0 1 0 1 0 However, when I try to perform this operation, I obtain: Error in t(X1) %*% X1 : requires numeric matrix/vector arguments Can someone please tell me what I seem to be doing wrong? thanks. Sincerely, Murali Kuchibhotla Murali Kuchibhotla Department of Economics Iowa State University Office:75,Heady Phone:515-294-5452 [[alternative HTML version deleted]]

Hello, I am interested in plotting my regression analysis results(regression coefficients and standard errors obtained through OLS and Tobit models) in the form of graphs.What is the best way to accomplish this? Thanks. Murali Kuchibhotla [[alternative HTML version deleted]]