Rich Ulrich wrote:
>
> On Mon, 5 Feb 2001 19:26:46 +0900, "rjkim" <[EMAIL PROTECTED]>
> wrote:
>
> > hi, all.
> >
> > Isn't a chi-squre test inherently a 'one-sided sig. test'?
>
> The chi-square is to F as the normal z is to t.
>
> t^2 (xx degrees of freedom) equals F (1, xx degrees of freedom).
> z^2 equals chi-squared.
>
> F is "two-tailed" and t can be "one-tailed."
> Similarly, for the other two.
>
Whoops?! You can use F in a one tailed test! For example, if the
alternative hypothesis is that sigma1^2/sigma2^2 > 1 (so the null is
that the ratio is less than or equal to 1.
Alan
--
Alan McLean ([EMAIL PROTECTED])
Department of Econometrics and Business Statistics
Monash University, Caulfield Campus, Melbourne
Tel: +61 03 9903 2102 Fax: +61 03 9903 2007
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