Which Test is Used to Verify Assumptions in TTest
- To: mathgroup at smc.vnet.net
- Subject: [mg120132] Which Test is Used to Verify Assumptions in TTest
- From: Gregory Lypny <gregory.lypny at videotron.ca>
- Date: Sat, 9 Jul 2011 07:32:37 -0400 (EDT)
I've run some simple t-tests of means using TTest and was pleased to see that Mathematica pretests for the validity of underlying assumptions. In a very skewed sample, I received a warning that the normality assumption had likely been violated. The warning looked like this:
TTest::nortst: "At least one of the p-values in 0., resulting from a test for normality, is below 0.05. The tests in T require that the data is normally distributed.
Is it possible to find out precisely which pretest Mathematica performed in order to generate that message?
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