What are you seeing here? I get identical results in the two cases.
On Mon, 13 Sep 2004 [EMAIL PROTECTED] wrote:
>
> # users would benefit from a warning about the behavior in the
> # groups.unbalanced case below. A propogation of difference is the variance
> # calculation is leading to an apparently significant difference in
> # means, even though the numeric values are all identical. Obviously upon
> # inspection the difference in means is meaningless, but users might be warned
> # if all of the input data is identical
That's not so easy to achieve, given rounding error, but I am seeing
0 variance in both cases.
> xx <- rep(2.10,80)
>
> groups.balanced <- as.factor(c(rep("one",40),rep("two",40)))
> groups.unbalanced <- as.factor(c(rep("one",44),rep("two",36)))
>
> t.test(xx ~ groups.balanced)
>
> t.test(xx ~ groups.unbalanced)
>
>
>
> <<insert bug report here>>
>
>
>
> --please do not edit the information below--
>
> Version:
> platform = sparc-sun-solaris2.8
> arch = sparc
> os = solaris2.8
> system = sparc, solaris2.8
> status =
> major = 1
> minor = 9.0
> year = 2004
> month = 04
> day = 12
> language = R
>
> Search Path:
> .GlobalEnv, package:methods, package:stats, package:graphics, package:utils,
> Autoloads, package:base
>
>
>
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--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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