Re: tails and variance

Eric Bohlman <ebohlman@xxxxxxxxxx> wrote:
> jhartdc@xxxxxxxxx wrote in news:1123350226.804610.13970
> @o13g2000cwo.googlegroups.com:
>
>> I am doing correlations as well, but I still want to do a t-test to see
>> if there is a difference between the groups.
>
> Sounds to me like you should be fitting a regression model and testing *it*
> rather than artificially dichotomizing your data, but that will depend on
> what the purpose of your research is. Are you trying to determine the
> relationship between age and blood pressure, or are you trying to justify a
> particular age-related cutoff point for clinical purposes?

Cutting the groups first and doing the test certainly wouldn't
accomplish this.
.

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