StatMate features

Calculate sample size - How many subjects (data points) do you need? Naturally, the answer is "it depends". It depends on how large a difference you are looking for, how much your data vary, and on how willing you are to risk mistakenly finding a difference by chance or mistakenly missing a real difference. StatMate helps you see the tradeoffs, so you can pick an appropriate sample size for your experiment.

Calculate power - Just because a study reaches a conclusion that the results "are not statistically significant" doesn't mean that the treatment was ineffective. It is possible that the study missed a small effect due to small sample size and/or large scatter. StatMate calculates the power of a test to detect various hypothetical differences.

Choose from these experimental designs:

• Compare two means (unpaired t test)
• Compare two paired means (paired t test)
• Compare two survival curves (logrank test)
• Compare two proportions (chi-square test)
• Compare a mean with a hypothetical value (one-sample t test)

System requirements
Windows: Windows 98 and up and 2 MB of free space.
Macintosh: OS 8.6 and up (including OS X) and 4 MB of free space.