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...right. Can anybody explain me what the reason for this problem is and how it affects the regression? Are the results still usable in spite of the NaNs? Thank you very much! Best, Johannes -- View this message in context: http://www.nabble.com/Problem-with-dummy-variables-controlling-for-years-tp22294013p22294013.html Sent from the R help mailing list archive at Nabble.com.