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Split Plot Design

Split plot designs randomize subjects to two treatments or factors, one of which is applied at the plot level and one which is applied at the individual level.

The term 'plot' is used becaused they were first used in agricultural experiments, but they are commonly used in industrial experiments as well. A better term might be 'split unit' designs (see Box, et al. section 9.2 for more discussion).

Design Parameters

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Design Parameter Explanation

Treatments (Plot)
A comma seperated list of the treatments to be fixed within a plot.
Treatments (Sub Plot)
A comma seperated list of the treatments to be randomized with a plot.
The number of times the blocked treatments will be run.
Seed (optional)
If the design is to be randomized, the seed for the random number generator. Use this to ensure repeatability of the randomization.


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Subject Number Block Plot Number Sub Plot Number Plot Treatment Sub Plot Treatment
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  • Box, G. E. P., Hunter, W. G., and Hunter, S. J. (1972), Statistics for Experimenters, New York: John Wiley & Sons, Inc..