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...ating Multivariate Sample selection model by using Full Information Maximum Likelihood (FIML)estimation method. I could not get any response. I formulated the following code of FIML to analyse univariate sample selection problem. Would you please advise me where is my problem library (sem) library(nrmlepln) Selection equation ws = c(w1, w2, w3) # values of dependent variables in selection equations are binary (1 and 0) zs = c(z1, z2, z3, z4, z5) # z1, z2, z3 continuous and z4 and z5 dummies explanatory variables in selection equation Level equation (extent of particular option use) ys = c(y1, y2,...