Matched groups to compare 3 or more factor levels

The idea of using matched pairs of experimental units to give more accurate comparisons of two factor levels can be generalised to experiments with 3 or more factor levels.

For example, in an experiment with 4 factor levels, the experimental units might be grouped into groups of 4 experimental units that are similar. The different factor levels should be randomly allocated to the units within each of the matched groups of 4 units. Again, this type of experiment results in more accurate estimates of the differences between the factor levels than a completely randomised experiment.

Three diets and beef from cows