I have a large table of data which i can read in using read.table. I then want to conduct various tests on the data.
Is there a simple way to conduct these tests by specifying the column headers which relate to different conditions of the experiment? e.g. data1 <- read.table("test.table", header=TRUE) t.test(test~control, data = data1) Which doesn't work and results in the error "Error in t.test.formula(test ~ control, data = data1) : grouping factor must have exactly 2 levels" Many Thanks Richard [[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.