The impact of omitted responses on the accuracy of ability estimation in item response theory. Ayala, R. J., Plake, B. S., & Impara, J. C. Journal of Educational Measurement, 38:213–234, 2001.
bibtex   
@article{ayala_impact_2001,
	title = {The impact of omitted responses on the accuracy of ability estimation in item response theory},
	volume = {38},
	journal = {Journal of Educational Measurement},
	author = {Ayala, R. J. and Plake, B. S. and Impara, J. C.},
	year = {2001},
	pages = {213--234}
}

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