Table 2.

Summary of Data-Generating Parameter Values.

	Slope (a)
	Minimum	Median	M	Maximum	SD
11-item test	0.82	1.43	1.40	2.14	0.42
22-item test	0.77	1.35	1.33	2.01	0.31
44-item test	0.78	1.42	1.43	2.33	0.38
	Difficulty (b)
	Minimum	Median	M	Maximum	SD
11-item test	−1.52	−0.12	−0.04	1.67	1.02
22-item test	−1.93	0.18	−0.01	1.87	1.05
44-item test	−2.05	0.00	−0.04	1.98	0.87