In randomized statistical experiments, generalized randomized block designs (GRBDs) are used to study the interaction between blocks and treatments. For a GRBD, each treatment is replicated at least two times in each block; this replication allows the estimation and testing of an interaction term in the linear model (without making parametric assumptions about a normal distribution for the error).[1]
^
Wilk, page 79.
Lentner and Bishop, page 223.
Addelman (1969) page 35.
Hinkelmann and Kempthorne, page 314, for example; c.f. page 312.
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