title: The economy of item analysis with the IBM graphic item counter.
authors.forename: W J
authors.initials: WJ
authors.lastname: McNAMARA
authors.forename: E
authors.initials: E
authors.lastname: WEITZMAN
mesh_terms: D006801:Humans; D007361:Intelligence Tests; D009946:Organothiophosphorus Compounds; D011874:Radiometry / Q000295:instrumentation*
chemical_list: D009946:Organothiophosphorus Compounds; C012568:terbufos
keywords: COUNTERS; MENTAL TESTS/machines