`` `` a poisson regression model with a surrogate x variable is proposed to help to assess the efficacy of vitamin a in reducing child mortality in indonesia . in a recent community trial , the mortality rate in villages receiving vitamin a supplementation was 35 % less than in control villages . however , at base-line , control villages were found to have slightly higher rates of xerophthalmia , an ocular disease caused by vitamin a deficiency . it was therefore desirable to adjust the mortality comparison for base-line vitamin a levels as indicated by xerophthalmia prevalence . this paper presents a parametric errors-in-x regression model developed for this purpose . likelihood methods for fitting and inference are discussed . the model is illustrated on the indonesian data set . '' ''
C0042842
vitamin a deficienc
C0042839
vitamin