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...ears for each object and include the numbers into the dataset. Could anybody help me, please? Alternatively, is there an easier way to achieve my goal? Thank you very much. Johannes Habel -- View this message in context: http://www.nabble.com/How-to-count-number-of-year-per-firm-in-panel-data--tp21958252p21958252.html Sent from the R help mailing list archive at Nabble.com.