On 27/08/2008, at 3:52 AM, Richard Emes wrote:
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"
with(data1,t.test(test ~ control)) # You do not need to specify the
method explicitly.
cheers,
Rolf Turner
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