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Two models are symbolically nested if you can tell they are nested just by looking at the model formula, without knowing what any variables or functions do The example on the anova.svyglm web page is I(sch.wide=="Yes")~ell+meals+mobility I(sch.wide=="Yes")~ell+meals+mobility+as.numeric(stype) I(sch.wide=="Yes")~ell+meals+mobility+stype The second and ...

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