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"name"(x)
"name"(x) <- value
"name"(x) <- value
"value"(x)
"value"(x) <- value
"id"(x)
"is.selected"(x)name returns character; value and id return
numeric; value but not id may be NA; is.selected returns
logical indicating whether this Category is a "selected" dichotomy. Setters
return x duly modified.
Categories dichotomize