Power on X 1.6.5 review
DownloadPower on X is an easy to use program for calculating the statistical power of tests.


Power on X is an easy to use program for calculating the statistical power of tests. Calculations can be a priori (performed on data derived from a pilot or previous studies) or post hoc where the data has already been derived. At present Power on X will perform power calculations based on one and twotailed tTests of means or correlations
The calculator consists of a main calculation window in which the data can be entered and the type of test selected. In addition, an 'effect size' calculator is also included which can calculate 'effect size' from means and standard deviation, means and two standard deviations (requires sample size to be known), means and standard error of means (requires sample size to be known), and correlation.
In 'paid' mode the program will also produce power and sample size tables for any given alpha (significance) value.
Here are some key features of "Power on X":
Written in Cocoa and therefore Mac OS X native
Calculate power for one and twotailed tTests
Calculate power for tTest of means and tTest of correlations
Perform post hoc and a priori power calculations
Calculate power tables for any given alpha (significance value) and a range of sample size
Calculate sample size tables for any given alpha (significance value) and a range of power values.
Limitations:
The demo version has a disabled table feature and a 'nag' screen.
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