Get the right sample size the first time

Imagine finding the right sample size for your research in minutes and testing the possible results before you begin your study. How much time, energy and resources do you think you could save? If your sample size is too small, you could miss important research findings. If it's too large, you could waste valuable time and resources. Why waste time on unnecessary or unproductive research? Get the right sample size the first time with SamplePower.

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