[R] stats tests on large tables

[John Kane]

Try
t.test(data1[,1],data1[,2]) 
for the first two columns of data1.




--- On Tue, 8/26/08, Richard Emes <r.d.emes at hfac.keele.ac.uk> wrote:

> From: Richard Emes <r.d.emes at hfac.keele.ac.uk>
> Subject: [R] stats tests on large tables
> To: r-help at 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 at 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]]