jim clark wrote:
> The chi^2 distribution is equivalent to the z distribution
> "folded over" so that both negative and positive tails of z are
> in the upper (i.e., positive) tail of chi^2. The same
> relationship holds between t and F. As we saw recently on this
> (or another stats list), there is much confusion between
> "one-tailed" in the sense of a directional test (which concerns
> the direction of differences or correlations) and "one-tailed" in
> the narrower sense of tail of distribution (e.g., chi^2). These
> uses are _not_ equivalent. Perhaps less confusing if we use
> "directional" or some other term besides "one-tailed" for the
> first sense.
Yes, especially if the discussion has extended from the t to other tests and
distributions!
Thom
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