Table 3.

Item Parameters of the NCS-6 in the United States and the United Kingdom.

	United States				United Kingdom
Item	a	b1	b2	b3	b4	b(m)	a	b1	b2	b3	b4	b(m)
NCS01	2.523	−1.887	−0.850	−0.168	1.200	−.426	2.196	−1.900	−0.791	−0.049	1.599	−.285
NCS02	2.711	−1.804	−0.967	−0.387	1.002	−.539	2.618	−2.061	−0.892	−0.190	1.299	−.461
NCS03	2.712	−2.253	−1.243	−0.811	0.419	−.972	2.034	−2.778	−1.469	−0.814	0.634	−1.107
NCS04	2.792	−2.107	−0.987	−0.433	0.792	−.684	1.804	−2.570	−1.268	−0.482	1.075	−.811
NCS11	2.418	−2.274	−1.396	−0.855	0.604	−.980	2.229	−2.571	−1.456	−0.735	0.954	−.952
NCS15	2.728	−2.074	−1.048	−0.346	0.860	−.652	2.004	−2.427	−0.963	−0.063	1.341	−.528

Note. NCS = Need for Cognition Scale; a = discrimination; b1-b4 = threshold; b(m) = means across b1-b4.