Table 1.

Model convergence rates (%) under all conditions.

Number of traits	Test lengtha	Proportion of pairs composed of items keyed in opposite directions (%)	Percentage of Likert items
			0%	20%	40%	60%
2	5:1	0	83	94	100	100
		20	95	100	100	100
	10:1	0	98	100	100	100
		20	100	100	100	100
5	5:1	0	100	100	100	100
		20	100	100	100	100
	10:1	0	100	100	100	100
		20	100	100	100	100
Average			97	99	100	100

^aThe test length is expressed as the ratio of the number of all questions in the test to the number of traits.