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...is worked fine. I have tried to go through the help files in R and Venables & Ripley 4th Edition but I couldn’t find appropriate solution for my problem. Please could you give me idea of how to go about it? Thanks BPM Attached is the part of the out put: fit <- glm.nb PFD~SEX+RES+TRAV+TRAVH+HEIGHT+WEIG+MUA+TEM+FEVV+VOM+HEA....,data=data) Error: NA/NaN/Inf in foreign function call (arg 1) In addition: Warning message: iteration limit reached in: theta.ml(Y, mu, n, limit = control$maxit, trace = control$trace > --------------------------------- Want to chat instantly with...