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...e regression contains no constant term? I tried to change the code of rq.fit.panel by delect "X=cbind(1,x)" and would like to know is that correct ? Thanks I really would appreciate some suggestions. Best Helen Chen -- View this message in context: http://www.nabble.com/Question-of-%22Quantile-Regression-for-Longitudinal-Data%22-tp23239896p23239896.html Sent from the R help mailing list archive at Nabble.com.

...nts? Here comes my questions What do these estimators' mean in quantile panel data? And does the coefficient, $coef, estimators order by m*p + n elements? Thanks I really would appreciate some suggestions. Best Helen Chen -- View this message in context: http://www.nabble.com/Question-of-%22Quantile-Regression-for-Longitudinal-Data%22.-tp20180665p20180665.html Sent from the R help mailing list archive at Nabble.com.