Table 1.
n | IRT model | Test length | |||||
---|---|---|---|---|---|---|---|
500 | 1PLM | 10 | 0.083 | 0.798 | 0.004 | 0.037 | 0.044 |
20 | 0.062 | 0.362 | 0.007 | 0.038 | 0.054 | ||
40 | 0.059 | 0.140 | 0.008 | 0.039 | 0.055 | ||
80 | 0.046 | 0.077 | 0.014 | 0.042 | 0.047 | ||
2PLM | 10 | 0.054 | 0.773 | 0.000 | 0.013 | 0.060 | |
20 | 0.040 | 0.188 | 0.000 | 0.013 | 0.060 | ||
40 | 0.038 | 0.070 | 0.000 | 0.038 | 0.053 | ||
80 | 0.043 | 0.050 | 0.006 | 0.042 | 0.060 | ||
3PLM | 10 | 0.093 | 0.896 | 0.000 | 0.008 | 0.056 | |
20 | 0.065 | 0.422 | 0.001 | 0.020 | 0.062 | ||
40 | 0.059 | 0.155 | 0.001 | 0.037 | 0.055 | ||
80 | 0.050 | 0.080 | 0.003 | 0.050 | 0.064 | ||
1,000 | 1PLM | 10 | 0.066 | 0.968 | 0.004 | 0.032 | 0.046 |
20 | 0.067 | 0.590 | 0.004 | 0.033 | 0.055 | ||
40 | 0.059 | 0.206 | 0.012 | 0.045 | 0.045 | ||
80 | 0.053 | 0.106 | 0.022 | 0.045 | 0.053 | ||
2PLM | 10 | 0.043 | 0.913 | 0.000 | 0.017 | 0.061 | |
20 | 0.050 | 0.434 | 0.000 | 0.033 | 0.060 | ||
40 | 0.052 | 0.103 | 0.000 | 0.050 | 0.053 | ||
80 | 0.041 | 0.055 | 0.002 | 0.047 | 0.057 | ||
3PLM | 10 | 0.087 | 0.962 | 0.000 | 0.005 | 0.049 | |
20 | 0.063 | 0.686 | 0.000 | 0.021 | 0.054 | ||
40 | 0.054 | 0.237 | 0.000 | 0.037 | 0.049 | ||
80 | 0.047 | 0.086 | 0.001 | 0.038 | 0.060 |
Note. 1PLM = 1-parameter logistic model; 2PLM = 2-parameter logistic model; 3PLM = 3-parameter logistic model; IRT = item response theory.