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Estimación de datos faltantes en medidas repetidas con respuesta binaria

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Author Info
Yolima Ayala ()
Oscar Orlando Melo ()
Abstract

Se propone una metodología para la estimación de datos faltantes en condiciones longitudinales con respuesta binaria, desde una perspectiva univariada, basada en máxima verosimilitud. Suponiendo que las respuestas son faltantes de forma aleatoria (FFA), en cada una de las ocasiones se emplea el algoritmo EM de dos formas distintas: en la primera, el paso E se expresa como una log-verosimilitud ponderada de la respuesta, condicionada a las anteriores ocasiones tomadas como covariables adicionales, con base en el método de Ibrahim (1990) para covariables categóricas faltantes, obteniendo de esta forma estimadores máximo verosímiles. En la segunda, en el paso E se realiza la estimación e imputación de datos faltantes basada en el método Ancova de Bartlett (1937). La metodología propuesta es aplicada en un caso de estudio relacionado con factores de riesgo coronario, presentado en Fitzmaurice et al. (1994).

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File URL: http://www.ciencias.unal.edu.co/publicaciones/estadistica/rce/V30/v30n2a08AyalaMelo.pdf
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Article provided by REVISTA COLOMBIANA DE ESTADISTICA in its journal Revista Colombiana de Estadística.

Volume (Year): (2007)
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Handle: RePEc:col:000163:004457

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  1. Horton N. J. & Lipsitz S. R., 2001. "Multiple Imputation in Practice: Comparison of Software Packages for Regression Models With Missing Variables," The American Statistician, American Statistical Association, vol. 55, pages 244-254, August. [Downloadable!] (restricted)
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This page was last updated on 2009-12-23.


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