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st: RE: RE: comparing mean
In addition, a -qqplot- is one way of
looking at the two distributions. There
are other graphical methods too, but -qqplot- is
one pretty closely directed at this kind of problem.
> On Monday, Samir wrote:
> >Dear Statalisters,
> >I am comparing average change in a utility score of patients in two
> >groups. I see that the initial distribution of utility score is not
> >same, one group have more patients with higher severity than
> the other.
> >How can I compare the mean between these two groups
> controlling for the
> >dissimilar distribution? How can I do it in Stata?
> Before deciding what type of test to use you need to look at the
> distribution of scores for each group. If it is fairly
> "bell-shaped" and
> does not have severe outliers the usual two-sample t-test to
> compare means
> can be used. Stata has -ttest- command to perform this test.
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