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5 Designs with several error termsThe randomized-block design is undoubtedly the most popular of the designs in commonuse, but sometimes more sophisticated arrangements may be required involving units ofdifferent sizes. For example, there are sometimes treatments, like plant varieties orirrigation, that cannot conveniently be applied to the small plots that are feasible fortreatments like levels of fertiliser or types of fungicide. In this chapter you will learn• how a split-plot design is constructed• how to analyse a split-plot design, and interpret the output• why the analysis of variance table for a split-plot design has more than one stratum(or error term)• how to define the block structure for other stratified designs • what happens when the response variate contains missing values Note: the topics marked are optional.