Andridge, R.R. and Little, R.J.A. (2011). Proxy Pattern--Mixture Analysis for Survey Nonresponse. Journal of Of+icial Statistics, 27, pp. 153--180.
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Andridge, R. R., Little, R. J. A. (2011). Proxy Pattern--Mixture Analysis for Survey Nonresponse. Journal of Of+icial Statistics, 27 pp. 153-180.
(xsd:string)