union value ;
-struct categoricals *categoricals_create (struct interaction *const *, size_t n_int,
+struct categoricals *categoricals_create (struct interaction *const*, size_t n_int,
const struct variable *wv, enum mv_class dep_excl,
enum mv_class fctr_excl);
double categoricals_get_sum_by_subscript (const struct categoricals *cat, int subscript);
-double categoricals_get_code_for_case (const struct categoricals *cat, int subscript, const struct ccase *c);
+/* Returns unity if the value in case C at SUBSCRIPT is equal to the category
+ for that subscript */
+double
+categoricals_get_dummy_code_for_case (const struct categoricals *cat, int subscript,
+ const struct ccase *c);
+
+/* Returns unity if the value in case C at SUBSCRIPT is equal to the category
+ for that subscript.
+ Else if it is the last category, return -1.
+ Otherwise return 0.
+ */
+double
+categoricals_get_effects_code_for_case (const struct categoricals *cat, int subscript,
+ const struct ccase *c);
/* These use the long map. Useful for descriptive statistics. */