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vladimir:
I used the t test because its appropriate for small data samples in a normal (Gaussian) distribution, which is an assumption that seems ok to me.
It is not ok because a ratio is generally not distributed as a Gaussian.

Most economists teach a theoretical framework that has been shown to be fundamentally useless. -- James K. Galbraith
by Migeru (migeru at eurotrib dot com) on Tue Mar 17th, 2009 at 09:31:06 AM EST
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