TY - JOUR T1 - Bi-level heterogeneity modeling of functional performance degradation for the aging population JF - IISE Transactions on Healthcare Systems Engineering Y1 - 2017 A1 - Sakib, Nazmus A1 - Sun, Xuxue A1 - Kong, Nan A1 - Meng, Hongdao A1 - Li, Mingyang KW - Cognitive Ability KW - Survey Methodology VL - 7 UR - https://www.tandfonline.com/doi/full/10.1080/24725579.2017.1339147https://www.tandfonline.com/doi/pdf/10.1080/24725579.2017.1339147 IS - 3 JO - IISE Transactions on Healthcare Systems Engineering ER -