[rkward-devel] power analysis plugin

[meik michalke]

hi thomas,

Am Samstag, 4. Oktober 2014, 10:34:58 schrieb Thomas Friedrichsmeier:
> looks really nice, already.

thanks :-)

> - Don't forget to require(pwr)

ouch...

> - I was rather confused by the distinction between "greater" and "less"
> alternatives for one-sided tests.

erm, yes, me too. only as a first step, i simply implemented all options from 
the functions and then wanted to check on the details later. btw, i wished the 
documentation of pwr would be a little more elaborate on stuff like this.

> 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).

good catch. yes, right now effect sizes can't be negative, i'll try to come up 
with something.

> I suggest, either going with "greater", only, or showing a warning, when the
> specified effect size contradicts the hypothesis.

if i take the first road and go astray from the pwr options, i'll probably 
rename "greater" to something like "one sided test (first is greater)". would 
anyone consider it too much a limitation to not being able to use negative 
effect sizes?

> - 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.

ok.

> - 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...

absolutely. these calculations are really quick, and in reality you probably 
want to see how your target measure behaves if one of the assumed parameters 
changes, without clicking through a dialog a dozen times.

in this particular case, it would be awesome if i could loop parts of the 
result back to the GUI, right to the control of the target measure, which is 
now greyed out when selected. maybe with a green border or something, so you 
understand that you cannot change it directly.


viele grüße :: m.eik

-- 
  dipl. psych. meik michalke
  institut f"ur experimentelle psychologie
  abt. f"ur diagnostik und differentielle psychologie
  heinrich-heine-universit"at d-40204 d"usseldorf
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