INCOMPLETE BLOCK DESIGNS IN WHICH THE NUMBER OF REPLICATES IS NOT THE SAME FOR ALL TREATMENTS

摘要

When designing experiments for comparison of the effects of treatments or varieties by means of an incomplete block arrangement, one often meets the difficulty that the usual requirement that every treatment occurs the same number of times, say r, cannot be satisfied. One has, e.g., only a very small quantity of seed of some (new) varieties available, while seed of other varieties is abundant. It is also possible that for some reason one has a minor interest in some of the varieties In comparison with the remaining varieties, and so does not wish to spend as many costs (replicates) on these varieties as on the more Interesting ones.