Split-plot design
= Split-plot design
A <split-plot design> randomizes one factor to whole plots and another to subplots within each whole plot. Whole-plot treatment effects and subplot treatment effects therefore use different error <ANOVA strata>. Whole plots provide <replication> for the first factor; their subplots do not supply extra independent whole-plot replication. Within-whole-plot comparisons can remove a shared additive whole-plot <variance component>.