Talk:Q test

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Does anyone have a particular reason why the Q can only be used once per data set? I understand it's not necessary when one data point has experimental error, but couldn't it be used on two different points if there still enough degrees of freedom left after the first point is rejected?

I'm a chemist, not a statistician, so any clarification would be great, especially since this page can then be updated.

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Sorry, I am not a Wiki expert, so excuse me if I have done this incorrectly. The first line of this article seems to be a copy and paste from http://science.widener.edu/svb/stats/qtest.html