Power on X

Minor update to Power on X

Power on X is a statistical power calculator for Mac OS X. The program can, using means, standard deviation (SD) or standard error of mean (SEM), and the sample size (n), calculate the effect size (‘sensitivity’), and therefore, for a given alpha level (significance level) the associated power of a given test.

The program has just been updated to version 1.5.4 which corrected a small problem with some power calculations when SEM was used.

This is not really the time, or the place, for a full discussion on the importance of statistical power.

Additional information can be found at:

http://www.mmisoftware.co.uk/pages/power.html

Information on the program (basically the help system for Power on X)

http://www.mmisoftware.co.uk/pages/powerh/index.html

And some suggested reading at:

http://www.mmisoftware.co.uk/pages/library/

Power on X can be downloaded from MMISoftware and is US$20.