Bayesian estimation of the parameters of the randomized ordinal probit regression model
Keywords:
ordinal probit regression, randomized ordinal response variable, bayesian inference, double exponential, distributionAbstract
A large number of papers estimate the prevalence of a randomized binary variable, but few model the effect of non-sensitive covariates on a randomized binary response variable. A small number of papers study a sensitive ordinal variable, and there are no papers that model the effect of non-sensitive covariates on a randomized ordinal response variable. The objective of this work is to use the Bayesian approach to measure the effect of non-sensitive covariates on a randomized ordinal response variable obtained under the forced response design and evaluate the performance of the proposed estimators. Four prior distributions were used: Double exponential, Normal, t and Cauchy. A simulation was performed to compare the Bayesian estimators studied considering two numbers of categories of the randomized ordinal response variable, two sample sizes, and two numbers of non-sensitive covariates. The comparison criteria were the mean squared error, the length and the coverage of the credible intervals. The proposed Bayesian estimators adequately estimated the true parameters of the randomized ordinal probit regression model, even when the forced response design induced by the Hopkins randomization device was used to produce a randomized ordinal response variable. The Bayesian estimator using the double exponential prior distribution was the best in terms of the criteria used.
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