I think some of this is a matter of vocabulary. Do you say 'one tailed
test' or 'one sided test'? (Ditto for 'two'.) People seem to use the two
phrases fairly interchangeably. In this context, it does not matter
whether you think of the F distribution as having two 'ends' - and you
can use one or both of them in a test - or two tails (one very short and
stubby, one long and skinny) - and you can use one or both of them in a
test.....
I used the term 'one-tailed' in my previous email. If you prefer, change
this to 'one sided'.
dennis roberts wrote:
>
> distributions are inherently TWO ended ... at least i have never seen one
> that had, say ... an upper end but no lower end ...
>
> how a particular significance TEST uses a distribution ... one end or both
> ... is a function of how the test statistic is defined
It is not the test statistic, but the test hypotheses that determine
whether a test is one or two sided.
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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