ANOVA power dialog for a crossover design

This GUI (separate window) may be used to study power and sample-size problems for a popular crossover design. The factors sequence, period, and treatment are arranged in a Latin square, and SUBJECT is nested in sequence.
Click or drag on the bar graphs to adjust values; or enter values in the text areas and hit RETURN. (Power values are not adjustable.) You can change the scales for the bar graphs by dragging from any point along the scale to its desired new position -- provided that this would not cause a bar to go out-of-bounds.

Feedback is welcome!
Russell V. Lenth (, Department of Statistics and Actuarial Science, The University of Iowa, Iowa City, IA 52245