R is complaining because you handed the 'oneway' function a single
string parameter.
Instead of
oneway = robjects.r['oneway.test']
test = oneway("values ~ ind, data=d, var.equal=TRUE")
try this:
test = robjects.r['oneway.test(values ~ ind, data=d, var.equal=TRUE)']
or
oneway = robjects.r['oneway.test']
test = oneway("values ~ ind", data=d, var.equal=True)
-Greg
-----Original Message-----
From: Juls Night [mailto:julsni...@yahoo.com]
Sent: Wednesday, April 08, 2009 11:38 PM
To: rpy-list@lists.sourceforge.net
Subject: [Rpy] Anova example
Hi,
I'm new to rpy2 and am trying out a few examples. I'm unfortunately
getting a
bit confused...
I've tried the example anova on the rpy2 document page and it works as
expected.
Now I'm trying to conduct an anova in a different way (and all I've
managed to
do is highlight my ignorance).
import rpy2.robjects as robjects
r = robjects.r
may=[2166, 1568, 2233, 1882, 2019]
sep=[2279, 2075, 2131, 2009, 1793]
dec=[2226, 2154, 2583, 2010, 2190]
d = r.stack(r.list(may=may,sep=sep,dec=dec))
robjects.globalEnv["d"] = d # Is this necessary here?
oneway = robjects.r['oneway.test']
test = oneway("values ~ ind, data=d, var.equal=TRUE")
I get the following error message:
Error in function (formula, data, subset, na.action, var.equal = FALSE)
:
'formula' missing or incorrect
Traceback (most recent call last):
File "<stdin>", line 14, in <module>
File "/usr/lib/python2.5/site-packages/rpy2/robjects/__init__.py",
line 422,
in __call__
res = super(RFunction, self).__call__(*new_args, **new_kwargs)
rinterface.RRuntimeError: Error in function (formula, data, subset,
na.action,
var.equal = FALSE) :
'formula' missing or incorrect
Any help will be greatly appreciated!
-J
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