(Re-) Read the docs (e.g. Intro to R, R Language Definition) . ... arguments have to be named!
t.test(sleep$extra,mu=0, alt = "greater") ## works -- Bert On Wed, Jun 19, 2013 at 6:50 AM, Sparks, John James <jspa...@uic.edu> wrote: > Dear R Helpers, > > I am stuck on some syntax and I thought that I was following one of the > examples that I found out there quite faithfully. > > I just want to know how to do a t test on a single mean for whether or not > it is greater than a specific value. So I am using the data set sleep and > I want to know if the mean of extra is greater then zero. I was under the > impression that the syntax is > > t.test(sleep$extra,mu=0,"greater") > > but I get the error message > > Error in t.test.default(sleep$extra, mu = 0, "greater") : > not enough 'y' observations > > I have tried this on a few other data sets that have more then 20 > observations and I get the same error. I looked in the documentation but > the examples are for the comparison of two groups, not a single group > mean. > > Any help would be most appreciated. > > --John J. Sparks, Ph.D. > > ______________________________________________ > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.
