Hi, On Saturday 04 October 2014 00:40:44 meik michalke wrote: > today i've started working on a plugin for power analysis/sample size > calculation. most of what you can get from the pwr package is already > implemented, open issues are handling of sample size estimation for designs > with two samples, and maybe a nicer printout... > > here's the generator script: > http://reaktanz.de/stuff/R/rkwarddev_power_plugin_script.R
looks really nice, already. Some first thoughts: - Don't forget to require(pwr) - I was rather confused by the distinction between "greater" and "less" alternatives for one-sided tests. This should not really make any difference, or should it? Then I tried, and didn't believe my eyes, until I figured out that for "less" you want to specify a _negative_ effect size (and in fact, you can't enter that in the GUI). I suggest, either going with "greater", only, or showing a warning, when the specified effect size contradicts the hypothesis. - I wouldn't write the results to the workspace _by default_. I guess the more common case is that the printout is all you want. - This is really something where a "generalized preview" (similar to the plot previews, but showing e.g. a piece of HTML printout) would be nice. But of course, we don't have that, yet... Regards Thomas
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