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...rst day for each person be time = 0, and the remaining dates to be handled as days since time 0. Also, is there a way to add the resulting slopes to the data set as a new column? Thanks, Marcel -- View this message in context: http://r.789695.n4.nabble.com/regression-on-data-subsets-in-datafile-tp3806743p3806743.html Sent from the R help mailing list archive at Nabble.com.