# Power Analysis for ANOVA Designs

This form runs a SAS program that calculates power or sample size
needed to attain a given power for **one** effect in a factorial
ANOVA design. The program is based on specifying Effect Size in terms of the **range** of treatment
means, and calculating the **minimum power**, or **maximum required
sample size**.

### Help Me With:

### Power Form

The calculations are performed using a SAS macro program, fpower.sas,
which is somewhat more general than presented here. The web interface is
written as a perl script, power.pl.
This script uses the cgi-utils.pl by Lincoln Stein.
### Other power analysis links

- Russ Lenth's power and
sample-size page
A Java application that performs interactive power analysis for a wide variety
of designs. Select, e.g., Balanced ANOVA from the pull-down list,
then enter the design in the pop-up windown. Once you've specified the
design, you can control various parameters using sliders.
- A Java applet for power analysis in one-way ANOVA designs
is available in Statlets.
- You can also find online power and sample size calculations for other simple models and statistical tests (by Jason Bond)here.
Also, see Len Thomas' comprehensive list of Power
Analysis software for PC's (Microsoft Word format)
or
a web document.

Michael Friendly

This URL: http://www.datavis.ca/online/power/
**Note:**This application is provided as free service.
I am unable to answer e-mail concerning power analysis.