-double
-levene (struct casereader *rx, const struct variable *gvar,
- const struct variable *var, const struct variable *wv, enum mv_class exclude );
+void levene_pass_one (struct levene *, double value, double weight, const union value *gv);
+void levene_pass_two (struct levene *, double value, double weight, const union value *gv);
+void levene_pass_three (struct levene *, double value, double weight, const union value *gv);