GAYAWAN Ezra (Publications)
Publisher Applied Spatial Analysis And Policy (Springer)
Publication Type Journal
Publication Title Spatial Distribution Of Malnutrition Among Children Under Five In Nigeria: A Bayesian Quantile Regression Approach
Publication Authors Ezra Gayawan, Samson B. Adebayo, Akinola A. Komolafe & Abayomi A. Akomolafe
Year Published 2017

Issues of malnutrition among young children in developing countries are gaining more attention of policy-makers because of the adverse effects on the wellbeing of people and economic of these nations. Anthropometric variables used for determining malnutrition are measured through z-scores where those whose measures fall into the extreme ends of the scores are considered malnourished. Conditional mean regression has been adopted to examine the determinants but often times, covariates would have effect on the mean, but have no substantial influence on more extreme quantiles. We adopt Bayesian quantile regression approach to measure the spatial distributions of childhood undernutrition at state and local government levels in Nigeria. Markov random fields and Bayesian P-splines were used as priors for the spatial and nonlinear components respectively and estimation was through MCMC technique. Results show the existence of north-south divide in undernutrition in Nigeria and that observed socioeconomic variables could have little influence on the distribution of undernutrition across space in the country.

Publisher Mathematical Population Studies (Taylor And Francis Journals)
Publication Type Journal
Publication Title Spatial Pattern And Determinants Of Age At Marriage In Nigeria Using A GeoAdditive Survival Model
Publication Authors Ezra Gayawan & Samson B. Adebayo
Year Published 2014

Age at first marriage, after controlling for socio-economic and demographic variables,
varies across regions and districts. A geo-additive hazard model allows for measuring
spatial effects. The nonlinear and baseline effects are modeled by Bayesian penalized
splines; spatial components are treated as correlated random effects following a Markov
random field. Application is based on data from 1999, 2003, and 2008 Nigeria Demographic
and Health Surveys. Age at first marriage is positively associated with education and
urbanization and depends on religion. It presents a north-south divide