SamplePower is packed with features designed to make finding accurate sample sizes easy. Convenience is built in at every level, from the smooth user interface to behind-the-scenes statistical computations that deliver results in seconds. You get the clear, precise answers you need to move forward with your research.
SamplePower's interactive guide leads you smoothly through your analysis. The guide explains terms and takes you through the steps necessary to determine an effective sample size.
SamplePower's interactive summary panel gives you concise summaries of power and precision at any point, so you can see how each decision affects your results.
The stored scenarios tool gives you optimum control over the flow of your research. You can vary alpha level, power, effect size or sample size in the main screen and store your results as you continue. This illustration shows how the sample size varies as other settings, such as alpha, are changed.
SamplePower's tables and graphs allow you to easily assess how different combinations of research parameters (such as proposed sample size, alpha levels and duration) will affect your statistical power.
SamplePower's Tool menu provides Cohen's effect size conventions, which allow you to determine effect sizes for particular tests by simply clicking on an icon. Cohen's effect size provides users with a "rule-of-thumb" for determining otherwise ambiguous "small," "medium" and "large" effect sizes. Plug these effect sizes into the main screen to see how varying the effect size affects power or precision.
SamplePower's Find N tool finds the sample size for the default power setting in one click. You also have the flexibility to choose different power size settings to compare results.
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