Main Effect

The average influence of a single factor on the response, averaged over all other factor levels.

Also known as: main effect, factor effect

The main effect of a factor is the change in the response when the factor moves from the low to the high level — averaged over all settings of the other factors.

Effect (A) = \overset{y}{ˉ}_{A +} - \overset{y}{ˉ}_{A -}

In regression form and coded units (±1), the main effect equals twice the associated regression coefficient. A significant main effect means the factor influences the response within the tested range.

Used in

DoE Planner
DoE Advisor
Regression Analysis
Contour Plot

In the Algorithm Lab

doe/doe-planner
regression/regression-coefficients

Sources

Montgomery, D. C. — Design and Analysis of Experiments, 10th Edition, Chapter 6
Box, Hunter & Hunter — Statistics for Experimenters, 2nd Edition

Main Effect

See also

Used in

In the Algorithm Lab

Sources