On Fri, 24 Mar 2000 14:13:04 GMT, [EMAIL PROTECTED] (Andy Gilpin)
wrote, citing me ( as >> ) from 23 March:
< snip, some >
> >Oh, Andy, this is such a naive *scaling* conclusion. How can you
> >regard "power" as a metric that ought to be equal-interval?
Andy>
> Wait a minute, Rich! I'll admit I'm often naive, but here I thought I
> was saying "Don't forget that power is NOT so simply related to N."
Wait again.
I thought/still think you were saying, look how much you can
increase N, and yet, power does *not* go up by much...
You pointed to the *appearance* of increases as if they were
- linear in N (as if that were not, ever and always, the wrong way to
consider N when looking at power), and
- linear in power (as if that were not bounded by 100%).
Whereas, I am saying -- taking from your own example -- simply
doubling N results in a boost of power (by 10); redoubling results in
a boost that is even bigger (by 250):
(me, before >> )
> >The first doubling corresponds to an Odds ratio, for your increase in
> >power, of 10:1, which might seem sizable, but the second doubling
> >provides an OR of 250:1. That is *one* way to say that I disagree.
> >
< snip, delete, some other topics >
--
Rich Ulrich, [EMAIL PROTECTED]
http://www.pitt.edu/~wpilib/index.html
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