Try
t.test(data1[,1],data1[,2])
for the first two columns of data1.
--- On Tue, 8/26/08, Richard Emes <[EMAIL PROTECTED]> wrote:
> From: Richard Emes <[EMAIL PROTECTED]>
> Subject: [R] stats tests on large tables
> To: r-help@r-project.org
> Received: Tuesday, August 26, 2008, 11:52 AM
> 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.
__________________________________________________________________
[[elided Yahoo spam]]
______________________________________________
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.
