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Under various misclassification and missingness mechanisms, we derive a general mixture regression structure for regression models that can incorporate multiple surrogates of categorical covariates that are subject to misclassification and missingness. In simulation studies, we demonstrate that including observations with missingness and\/or multiple surrogates of the covariate helps alleviate the efficiency loss caused by misclassification. In addition, we study the efficacy of misclassification adjustment when the number of categories increases for the covariate of interest. Using data from the Longitudinal Studies of HIV-Associated Lung Infections and Complications, we perform simultaneous adjustment of misclassification and missingness in the self-reported cocaine and heroin use variable when assessing its association with lung density measures. <\/jats:p>","DOI":"10.1177\/09622802221094941","type":"journal-article","created":{"date-parts":[[2022,4,27]],"date-time":"2022-04-27T08:33:11Z","timestamp":1651048391000},"page":"1449-1469","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["A Bayesian approach to simultaneous adjustment of misclassification and missingness in categorical covariates"],"prefix":"10.1177","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5137-2002","authenticated-orcid":false,"given":"Michelle","family":"Xia","sequence":"first","affiliation":[{"name":"Department of Statistics and Actuarial Science, Northern Illinois University, Dekalb, IL 60115, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rexford M.","family":"Akakpo","sequence":"additional","affiliation":[{"name":"Department of Statistics and Actuarial Science, Northern Illinois University, Dekalb, IL 60115, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2022,4,27]]},"reference":[{"key":"bibr1-09622802221094941","doi-asserted-by":"publisher","DOI":"10.1111\/j.1467-842X.2001.tb00294.x"},{"key":"bibr2-09622802221094941","first-page":"A71","volume":"5","author":"Rubin LH","year":"2007","journal-title":"J Undergrad Neurosci Educ"},{"key":"bibr3-09622802221094941","unstructured":"Shieh M-S. 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