Table C11.

Correlation between the preferred CAT's ability estimates and the full CDI for English production by age group.

Scoring/start item	[12, 15)	[15, 18)	[18, 21)	[21, 24)	[24, 27)	[27, 30)	[30, 33)	[33, 36]
ML/MI	0.966	0.975	0.978	0.984	0.977	0.971	0.943	0.934
MAP/MI	0.985	0.979	0.98	0.985	0.977	0.971	0.944	0.939
ML/age-based	0.966	0.976	0.978	0.985	0.977	0.973	0.955	0.919
MAP/age-based	0.985	0.98	0.979	0.985	0.977	0.973	0.957	0.94