Multilevel Study of Global Status of Road Traffic

Abstract

The field of modelling, multilevel data is a new approach. This research study examines the emerging role of modelling multilevel data in the context of analysing the factors associated with number of deaths due to road traffic accidents and type of road user which has the highest death rate. One of the objectives of this project is to perform a missing value imputation in the context of multilevel data. It was successfully obtained by performing multiple imputation using ‘jomo’ package in R statistical software. Generalized linear mixed models (GLMM) within the ‘Glimmix’ procedure of ‘SAS’ software was used to model the number of road deaths response and type of road user which has the highest death rate response. The study was based on data which were retrieved from the “GLOBAL STATUS REPORT ON ROAD SAFETY 2015” which was published by World Health Organization. It consists of worldwide data related to socioeconomic, health and law variables in 180 United Nations countries in six regions. This study showed that the modelling of the number of road deaths and type of road user which has the highest death rate could be adequately done using a GLMM with a Negative Binomial model and Multinomial model respectively. A cluster effect was assumed within regions. The internal and external validation showed that the model predicts well.