Use SamplePower to easily determine the sample size you need.
Get accurate sample sizes every time using SamplePower.
SamplePower arrives at a defensible sample size for a variety of common data analysis situations. With SamplePower, you strike the right balance among confidence level, statistical power, effect size and sample size.
Use SamplePower before you collect data. You can easily determine the sample size you need to have a reasonable chance of rejecting the null hypothesis in favor of your research hypothesis. After all, with a sample size that's too small, you could miss out on important research findings. On the other hand, a sample size that's too large wastes time and money.
In just a few easy steps, SamplePower helps you find the best sample size for your research. You can compare the effects of different study parameters with the flexible analytical tools. And with an interactive guide and built-in help features, you won't lose time getting up to speed. Developed by SPSS and a team of experts, including Michael Borenstein, Hannah Rothstein and Jacob Cohen, author of Statistical Power Analysis for the Behavioral Sciences, SamplePower is designed to cover:
- Means and differences in means
- Proportions and differences in proportions
- Correlation
- Oneway and factorial Analysis of Variance (ANOVA)
- Analysis of Covariance (ANCOVA)
- Regression and logistical regression
- Survival analysis
- Equivalence tests
Requirements
- Windows 95 or Windows NT 4.0
- 486 PC or higher
- 8MB hard drive space
- 8MB RAM (16MB recommended)
- VGA monitor (SVGA recommended)
- math co-processor
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