[rkward-devel] wilcoxon tests

[Thomas Friedrichsmeier]

Hi,

On Monday 12 December 2011, meik michalke wrote:
> looking at the details sections of both ?wilcox.test and
> ?exactRankTests:::wilcox.exact, the two functions used by the dialogs
> "Wilcoxon Test" and "Wilcoxon Exact Test", they seem to differ only in the
> handling of ties. may i merge the two into one dialog? i find the current
> split into two separate dialogs a little confusing, given that both do
> exact tests under certain conditions. both functions have almost identical
> signatures and both return an object of class htest.

sounds reasonable to me. Stefan, you created those plugins. Do you agree, too?
 
> btw, i also added support for tests against costants to the t-test plugin,
> is that ok?

This looks ok to me for the moment. I corrected a typo, and the initial value 
of the constant.

However in the long run, there is a bunch more features that we should add:
- Testing an arbitrary number of variables against each other or against a 
constant
- Support for data in long format (single outcome variable and grouping 
factor). Using all levels or selected levels of the grouping factor(*).
- Various modes of alpha correction

I think having all of that inside a single plugin will be too much, so we will 
have to split all that into two or more plugins. Once at that point, I think 
it may make sense to restore one "very simple" t-test plugin, which may or may 
not look like the one without support for testing against constants.

BTW, while testing your addition, I noted some more details that could be 
improved:
- "Paired sample" and "Assume equal variances" should probably be on the same 
tab. Having mutually exclusive options on different tabs has some potential for 
confusion.
- "Print confidence interval" should be a checkable frame, instead of a 
checkbox.
Should I go ahead and do that, or are you still working on the plugin?

Regards
Thomas

(*) And I know, that's another use case for a <valueselector>.
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