Rich Ulrich ([EMAIL PROTECTED]) wrote:
: Notice, you can take out a 0.1% test and leave the main
: test as 4.9%, which is not effectively different from 5%.
I've no problem with having different probabilities in the
two tails as long as they're specified up front. I say
so on my web page about 1-sided tests. I have concerns about
getting investigators to settle on anything other than
equal tails, but that's a separate issue.
The thing I've found interesting about
this thread is that everyone who seems to be defending
one-tailed tests is proposing something other than a
standard one-tailed test!
FWIW, for large samples, 0.1% in the unexpected tail
corresponds to a t statistic of 3.09. I'd love to
be a fly on the wall while someone is explaining to
a client why that t = 3.00 is non-significant! :-)
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