[R] shapiro.test

Clint Bowman clint at ecy.wa.gov
Tue Feb 25 00:48:10 CET 2014


For some authors the 4th page from the back should be the first page.

Not so for you, however.


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On Mon, 24 Feb 2014, Greg Snow wrote:

> Philippe,
> replies inline
> On Sat, Feb 22, 2014 at 12:29 AM, Philippe Grosjean
> <phgrosjean at sciviews.org> wrote:
>> Greg,
>> I really like that TeachingDemos::SnowsPenultimateNormalityTest()...
> If you like that function then you may appreciate
> TeachingDemos::SnowsCorrectlySizedButOtherwiseUselessTestOfAnything,
> which I suspect (but have been to lazy to check) may be the longest
> exported function name in a CRAN package.  I justify the names of
> these 2 functions using the same logic that suggests short and simple
> names for functions that you would expect to be used often.
>> even the tortuous way to always return a p-value == 0:
> It turns out (discovered by accident and then brought to my attention)
> that if you run SnowsPenultimateNormalityTest on a vector of length 0
> then it does return a p-value of 1.  I have not yet decided if this is
> a bug or a feature.  On one hand it makes sense that a sample of size
> 0 is perfectly consistent with the assumption that you chose 0
> observations from a normal distribution, on the other hand, if it is
> an integer or double vector of length 0 that would still be
> information that the numbers (or lack thereof) are rational.
> [snip]
>> I am just curious... Are there teachers out there pointing to that test? If yes, what fraction of the students realise what happens? I guess, it is closer to zero than to one, unfortunately. Wait... I need another SnowsPenultimateXxxxTest() here to check the null hypothesis that all my students are doing what they are supposed to do when discovering a new statistical tool!
> I don't know of any teachers pointing to the test, I would want to be
> careful which class to bring it up in.  For some students it could
> result in an epiphany, others may just blindly use it, and still
> others may have their heads explode if they have to think to hard
> about it.
> I was originally considering naming the test SnowsAntepenultimeateTest
> to give a little more room for follow-up tests, but at the time I
> could not remember if it was Ante (before) or Anti (opposite).  I
> learned the word Antepenultimate in terms of pages in a book, where
> the 3rd to last page (the Antepenultimate page) is directly opposite
> (Anti-) the Penultimate page.
> Just in case that is not confusing enough, the ultimate page of a
> cheap detective novel is the last page where the hero realizes that
> since the motive for the murder was to cover up the murderer's
> embezzlement of the family fortune to pay off his bookie, the hero
> will not be paid after all and will still need to continue avoiding
> his loan shark.  The penultimate page is the second to last page where
> in response to the hero's listing of circumstantial evidence the
> murderer conveniently confesses and fills in all the missing details
> saving the embarrassment to the hero if he had just lawyer-ed up and
> been acquitted due to lack of hard evidence.  And the antepenultimate
> page is the 3rd to last where the hero utters the cliche phrase "You
> are probably wondering why I gathered you all here".  I don't know
> what the 4th to last page would be called (could add another ante-, or
> in R just use tail(book,4)).
> -- 
> Gregory (Greg) L. Snow Ph.D.
> 538280 at gmail.com
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