JSR Vol 52 Number 1 (2018) September 2, 2018September 2, 2018 Co-Editor Guidance for practitioners on the choices of software implementation for frailty models: Simulations and an application in determining the birth interval dynamics By M. E. KARIM and J. R. KHAN The non-stationary bivariate INAR under an unconstrained inter correlation structure By Y. SUNECHER, N. M. KHAN, and V. JOWAHEER Estimation of density and distribution functions of a Burr X distribution By A. K. MAHTO, Y. M. TRIPATHI, and S. DEY A generalized linear model for multivariate correlated binary response data on mobility index By M. N. Uddin and M. BEGUM The recurrence relations of order statistics moments for power Lomax distribution By D. KUMAR and M. NASSAR Variants of double robust estimators for two-stage dynamic treatment regimes By A. S. TOPP, G. S. JOHNSON, and A. S. WAHED