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

Version: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 two-tailed t-Tests of means or correlations1.6.5

License:Free To Try$30.00

Operating System:Mac OS X

Homepage: www.mmisoftware.co.uk

Developed by:

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. The registered version of Power on X is able to produce power and sample size tables for any given alpha value.

Here are some key features of "Power on X":

· Written in Cocoa and therefore Mac OS X native

· Calculate power for one and two-tailed t-Tests

· Calculate power for t-Test of means and t-Test 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.