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Hi everybody How do I do to calculate the median and average of a colum of time data like this: "8:50:10". I also need to plot the time difference between two colums Thanks a lot -- View this message in context: http://n4.nabble.com/median-for-time-data-tp932287p932287.html Sent from the R help mailing list archive at Nabble.com.

hi again I will try this time to explain my problem clearly I have the following data from the file skiing.csv (3 first rows) protokollid date start end 1 4 2/23/2009 8:50:10 15:17:30 2 4 2/24/2009 9:47:00 13:52:25 3 5 3/22/2009 8:51:25 12:00:05 I have the following script library(chron) skiers=read.csv("skiing.csv")