Hello Nicola, > sentences_trial <- sentences[which(sentences$Cond!= "an"),]
That should be == "an" instead of = "an" == is the test for equality whereas = is assignment Michael ______________________________________________ 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.
