A Random-Effects Ordinal Regression Model for Multilevel Analysis. Hedeker, D. & Gibbons, R. D. Biometrics, 50:933–944, 1994.
bibtex   
@article{hedeker_random-effects_1994,
	title = {A {Random}-{Effects} {Ordinal} {Regression} {Model} for {Multilevel} {Analysis}},
	volume = {50},
	journal = {Biometrics},
	author = {Hedeker, D. and Gibbons, R. D.},
	year = {1994},
	pages = {933--944}
}

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