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...quot;27","28") ) myframe As you can see for Ernie I do have different data for 24.09.2012 9:00. Now I would like to average the Hunger and Temp value for this timestamp to get a data frame without duplicated Times and the respective average Temp and Hunger. I tried something like Meanframe<- by(myframe[, 3:4], duplicated(myframe$ID, Zusatzdaten3$Timestamp) == TRUE, mean) but it doesn't work and I guess that it is also totally crap ;-) Tagmarie -- View this message in context: http://r.789695.n4.nabble.com/average-environmental-data-if-AnimalID-and-Time-is-duplicated-tp4...