Dear Mr. Holtman, thank you for your reply.
I think I did say which mean I needed: "all of these reaction times per test subject. ", which means that I need a file with the mean of reaction times of each file / of each test subject (because file XYZ_34.txt is identical with subject 34's data). There are 65 x 152 reaction times and I need 65 x mean(152 reaction times per test subject file) = 65 mean reaction times. I have now provided an example for a test subject 34: http://r.789695.n4.nabble.com/file/n4635834/XYZ_34.txt XYZ_34.txt Kind regards -- View this message in context: http://r.789695.n4.nabble.com/Extracting-arithmetic-mean-for-specific-values-from-multiple-txt-files-tp4635809p4635834.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
