Power & Effect: A statistical utility for Macintosh and Windows systems

Significance tests are not the only step in statistics. Other considerations include effect sizes and adequate sample sizes for a respectable level of statistical power. However, many statistical packages are spotty in their offerings of effect size, complex, and lack a friendly interface. Textbooks may have limited coverage, and calculations entail several formulas and tables. Power & Effect offers a calculator- and formula-based metaphor to compute popular measures of effect size, simple significance tests between effect sizes, combining of effect sizes, simple significance tests based on known statistical values, and sample size determinations based on predicted results or effect size.