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...adding a variable at a time reaching a maximum of 20 variables. I get the following warning messages after my "for" loop runs. Should I be concerned about these messages? I am building predictive models and am not interested in inference. Warning messages: 1: In summary.rq(quantreg.emaff) : 3 non-positive fis <- I don't understand this message - is this a cause for concern? 2: In summary.rq(quantreg.emaff) : 3 non-positive fis 3: In summary.rq(quantreg.emaff) : 5 non-positive fis 4: In rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique 5: In summary.rq(quantre...