Skip to main content
. 2018 Nov 30;79(4):665–687. doi: 10.1177/0013164418814898

Table 2.

Average RMSE Values and Average Correlations for the Parameters of the Items and the Average Execution Time, in Seconds.

M2PL-Q models N RMSE
Correlation
Time
aj1 aj2 aj3 bj aj1 aj2 aj3 bj
Full 500 .136 .135 .153 .194 .860 .851 .814 .993 2,353
1,000 .112 .107 .130 .113 .860 .880 .861 .996 6,305
Bifac 500 .203 .226 .330 .113 .900 .839 .826 .994 985
1,000 .158 .199 .246 .085 .934 .871 .939 .997 3,012
Custom 500 .215 .267 .178 .113 .939 .967 .961 .994 662
1,000 .170 .301 .150 .086 .970 .973 .973 .996 1,847

Note. M2PL-Q = multidimensional two-parameter logistic model with a Q-matrix; RMSE = square root of the mean square error.