Abstract
Religious participation, a trichotomous response in the form of a two-item Guttman scale, is affected linearly by sex and by marital status, but the effect of color is nonlinear Techniques illustrated in the paper allow the analy st to impose simultaneously the two linear constraints and a nonlinear contrast of extreme response categories versus the middle one to represent the color effect. Such techniques should prove useful as analysts consider the possibilities of specifying structural models for categorical data

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