Is there minimum sample size for each group in 1-way ANOVA? if yes, please give a reference(s), If no, why there is not?

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    $\begingroup$ At least some software will let you run ANOVA with one observation in each group. It's just that the results are not very useful and some results are not defined. $\endgroup$ – Nick Cox Sep 22 '14 at 14:53
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    $\begingroup$ oneway ANOVA sample size and power calculations are more complex than t test calculations. Glanz gives a detailed set of methods for power and sample size calcs on the one-way ANOVA in Glantz, S. A. (2005). primer of biostatistics. McGraw-Hill Medical, New York, NY, 7th edition. $\endgroup$ – Alexis Sep 22 '14 at 17:54

Technically speaking, there should be two or more observations in at least one cell (treatment). I.e., if there are n cells, you can perform analysis with (n + 1) observations. Moreover, if you use Poisson regression, it's enough to have just one observation per cell.


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