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I measured one dependent variable between three groups of data (control, group1, group2).The result of t-test indicates significant difference between control and group 1 (p vale =.04), control and group 2(p value .01), but not significant between group 2 and group 3.Do I still need to use the post hoc test? If so, which test is the most appropriate?

edited Apr 29 2010 at 3:24

Yemon Choi
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asked Apr 26 2010 at 18:55

kamran
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	Kamran, I suspect you're at the wrong site for this question and are unlikely to get a good answer. We don't currently have many mathematicians here who are interested in statistics, but even if we did this question looks more like a practical question about scientific conventions rather than a theoretical question of interest to mathematicians. A similar question mathoverflow.net/questions/22532 did not get any answers. You and Pat could discuss whether there's a community for a statistics SE site, but I do not think MO is the place for that since we're mathematicians not scientists. – Noah Snyder Apr 26 2010 at 21:51
	There is a proposal for a statistics SE site here: meta.stackexchange.com/questions/5547 – Rob J Hyndman Apr 29 2010 at 1:05

Rob J Hyndman · Answer 1 · 2010-04-29 01:04:42Z UTC

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If you've got more than two groups, don't use t-tests (due to the multiple comparisons trap). Use a one-way ANOVA instead (based on an F-test). Then if you want a post-hoc test after that, use Tukey's HSD.

answered Apr 29 2010 at 1:04

Rob J Hyndman
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statistical analysis between 3 groups of data - what is the approptiate post hoc test for them?

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