Abstract
Although many theoretical papers on the estimation method of marginal maximum likelihood of item parameters for various models under item response theory mentioned Gauss–Hermite quadrature formulas, almost all computer programs that implemented marginal maximum likelihood estimation employed other numerical integration methods (e.g., Newton–Cotes formulas). There are many tables that contain quadrature points and quadrature weights for the Gauss–Hermite quadrature formulas; but these tabled values cannot be directly used when quadrature points and quadrature weights are specified by the user of computer programs because the standard normal distribution is frequently employed in the marginalization of the likelihood. The two purposes of this paper are to present extensive tables of Gauss–Hermite quadrature for the standard normal distribution and to present examples that demonstrate the effects of using various numbers of quadrature points and quadrature weights as well as different quadrature formulas on item parameter estimates. Item parameter estimates obtained from more than 20 quadrature points and quadrature weights with either Gauss–Hermite quadrature or the Newton–Cote method were virtually identical.
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Appendices
Appendix 1
N = 10
XI
-3.436159118837738E+00 -2.532731674232789E+00 -1.756683649299880E+00 -1.036610829789513E+00 -3.429013272237046E-01
3.429013272237046E-01 1.036610829789513E+00 1.756683649299880E+00 2.532731674232789E+00 3.436159118837738E+00
AI
7.640432855232643E-06 1.343645746781229E-03 3.387439445548111E-02 2.401386110823148E-01 6.108626337353258E-01
6.108626337353258E-01 2.401386110823148E-01 3.387439445548111E-02 1.343645746781229E-03 7.640432855232643E-06
N = 20
XI
-5.387480890011237E+00 -4.603682449550741E+00 -3.944764040115622E+00 -3.347854567383215E+00 -2.788806058428129E+00
-2.254974002089274E+00 -1.738537712116586E+00 -1.234076215395323E+00 -7.374737285453945E-01 -2.453407083009013E-01
2.453407083009013E-01 7.374737285453945E-01 1.234076215395323E+00 1.738537712116586E+00 2.254974002089274E+00
2.788806058428129E+00 3.347854567383215E+00 3.944764040115622E+00 4.603682449550741E+00 5.387480890011237E+00
AI
2.229393645534086E-13 4.399340992273155E-10 1.086069370769280E-07 7.802556478532085E-06 2.283386360163550E-04
3.243773342237865E-03 2.481052088746362E-02 1.090172060200233E-01 2.866755053628341E-01 4.622436696006098E-01
4.622436696006098E-01 2.866755053628341E-01 1.090172060200233E-01 2.481052088746362E-02 3.243773342237865E-03
2.283386360163550E-04 7.802556478532085E-06 1.086069370769280E-07 4.399340992273155E-10 2.229393645534086E-13
Appendix 2
N = 10
XK
-4.859462828332313E+00 -3.581823483551926E+00 -2.484325841638953E+00 -1.465989094391158E+00 -4.849357075154976E-01
4.849357075154976E-01 1.465989094391158E+00 2.484325841638953E+00 3.581823483551926E+00 4.859462828332313E+00
A(XK)
4.310652630718300E-06 7.580709343122154E-04 1.911158050077032E-02 1.354837029802678E-01 3.446423349320191E-01
3.446423349320191E-01 1.354837029802678E-01 1.911158050077032E-02 7.580709343122154E-04 4.310652630718300E-06
N = 20
XK
-7.619048541679765E+00 -6.510590157013650E+00 -5.578738805893197E+00 -4.734581334046053E+00 -3.943967350657314E+00
-3.189014816553388E+00 -2.458663611172368E+00 -1.745247320814127E+00 -1.042945348802751E+00 -3.469641570813560E-01
3.469641570813560E-01 1.042945348802751E+00 1.745247320814127E+00 2.458663611172368E+00 3.189014816553388E+00
3.943967350657314E+00 4.734581334046053E+00 5.578738805893197E+00 6.510590157013650E+00 7.619048541679765E+00
A(XK)
1.257800672437891E-13 2.482062362315165E-10 6.127490259982936E-08 4.402121090230865E-06 1.288262799619300E-04
1.830103131080495E-03 1.399783744710101E-02 6.150637206397688E-02 1.617393339840000E-01 2.607930634495547E-01
2.607930634495547E-01 1.617393339840000E-01 6.150637206397688E-02 1.399783744710101E-02 1.830103131080495E-03
1.288262799619300E-04 4.402121090230865E-06 6.127490259982936E-08 2.482062362315165E-10 1.257800672437891E-13
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Kim, SH., Bao, Y., Horan, E., Kim, M., Cohen, A.S. (2015). Gauss–Hermite Quadrature in Marginal Maximum Likelihood Estimation of Item Parameters. In: van der Ark, L., Bolt, D., Wang, WC., Douglas, J., Chow, SM. (eds) Quantitative Psychology Research. Springer Proceedings in Mathematics & Statistics, vol 140. Springer, Cham. https://doi.org/10.1007/978-3-319-19977-1_4
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