On sample size calculation for 2x2 fixed-effect ANOVA when variances are unknown and possibly unequal.

@article{Guo2009OnSS,
  title={On sample size calculation for 2x2 fixed-effect ANOVA when variances are unknown and possibly unequal.},
  author={Jiin-Huarng Guo and Wei Ming Luh},
  journal={The British journal of mathematical and statistical psychology},
  year={2009},
  volume={62 Pt 2},
  pages={
          417-25
        }
}
The factorial 2 x 2 fixed-effect ANOVA is a procedure used frequently in scientific research to test mean differences between-subjects in all of the groups. But if the assumption of homogeneity is violated, the test for the row, column, and the interaction effect might be invalid or less powerful. Therefore, for planning research in the case of unknown and possibly unequal variances, it is worth developing a sample size formula to obtain the desired power. This article suggests a simple formula… CONTINUE READING

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