Dear Group, I want to do a t-test calculation on a large data set.
I am pasting some part of it structure(list(Name = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 3L, 3L, 3L, 3L, 3L, 3L, 3L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("CTK100", "CTK103", "CTK121"), class = "factor"), Score = c(236.9726, 207.0055, 237.3464, 224.4774, 236.5034, 206.7382, 233.94, 240.31, 240.9, 235.15, 223.36, 248.67, 249.25, 201.4051, 244.1689, 182.2756, 229.001, 241.3211, 196.0453, 232.6055, 225.0783, 196.0453, 232.6055, 225.0783 )), .Names = c("Name", "Score"), class = "data.frame", row.names = c(NA, 24L)) I want to compare groups with CTK100 and with all the groups and want to save the p-values and mean for each of that particular group (for example: mean for CTK and all) Similarly, for other groups like that CTK121 etc... Is there any way to automate this process? Thanks for your advice !!!!! Nico [[alternative HTML version deleted]] ______________________________________________ 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.