As enunciated by Ronald A. Fisher, a randomized block design (RBD) is the simplest design for comparative experiment using all three basic principles of experimental designs: randomization, replication, and local control. In this design, the treatments are allocated to the experimental units or plots in a random manner within homogeneous blocks or replications. It is appropriate only when the experimental material is heterogeneous. It may be used in single- or multifactor experiments. This entry considers the application, advantages and disadvantages, layout, randomization methods, and statistical analysis of randomized block designs.
Randomized block design is most useful in situations in which the experimental material is heterogeneous and it is possible to divide the experimental material into homogeneous groups of units or plots, called blocks or replications.
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