ISSN : 1229-067X
Excessive zeros are frequently observed in response variables when behavioral characteristics in the development of children are assessed. For example, in the Korean Bayley Scales of Infant and Toddler Development-Third Edition (KBSID-III)-adaptive behavior test, zero scale was excessively recorded more than other scales, such as 1, 2, or 3. A regular ordered probit (OP) model can be used when more than two outcomes appear in ordinal dependent variables. However, it is not appropriate for an OP model to be used with zero-inflated ordinal data. An OP model also has a limitation when there are two semantically distinctive groups, genuine non-participant and potential participant groups. We applied a two-step zero-inflated ordered probit (ZIOP) model in a Bayesian framework to the KBSID-III-adaptive behavior data. In the first step, the adaptive group (potential adaptive group was included) was separated from the genuine non-adaptive group using a probit model. In the second step, an OP model was applied to the adaptive group. A Bayesian estimation procedure to the ZIOP model was carried out with a Gibbs sampling algorithm using the open-source software R. The utility of the ZIOP model with zero-inflated ordered categorical variables was verified by checking the maginal effect of predictors on the change in the probability of a certain category.
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