W. Amir W Ahmad, N. Zafakali, N. Halim, N. Aleng, and S. Zakaria, “A STUDY OF AN EFFICIENCY OF HANDLING OVERDISPERSION USING POISSON REGRESSION AND ZERO INFLATED POISSON REGRESSION: A THALASEMIA CASE STUDY”, JASR, vol. 6, no. 02, pp. 33-38, May 2015.