Psychometric properties of computerized adaptive testing for chronic obstructive pulmonary disease patient-reported outcome measurement

Table 2 The average SEM and number of items administered, and correlation coefficient between simulated and true theta estimates in different simulation tests

Sample size	Average number of items administered	Average SEM	Correlation coefficient between simulated and true theta estimates
Random method
60	10	0.290	0.975
100	10	0.290	0.976
300	10	0.291	0.976
500	10	0.291	0.970
1000	10	0.291	0.973
3000	10	0.291	0.972
5000	10	0.290	0.973
MFI method
60	7	0.289	0.968
100	7	0.292	0.979
300	7	0.289	0.975
500	7	0.290	0.973
1000	7	0.289	0.974
3000	7	0.290	0.977
5000	7	0.290	0.977

Abbreviations SEM, Standard Error of Measurement; MFI, Maximum Fisher Information

ISSN: 1477-7525