I used str(slovenia) and saw I was using wrong names - instead of year I tried years and the same with age. For hmd.mx you need package RCurl. Thank you very much for your help! Martina -- View this message in context: http://r.789695.n4.nabble.com/hmd-mx-tp4630350p4630439.html Sent from the R help mailing list archive at Nabble.com.