[R] T test for Single Mean
Sparks, John James
jspark4 at uic.edu
Wed Jun 19 15:50:28 CEST 2013
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
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
Any help would be most appreciated.
--John J. Sparks, Ph.D.
More information about the R-help