TY - ELEC T1 - The Age Period Cohort Identification Problem. YouTube video UR - https://www.youtube.com/watch?v=t0GuikebSNw UR - https://www.youtube.com/watch?v=t0GuikebSNw PY - 2017/06/13 AU - Bell AJ ED - PB - 葫芦影业 Methods Institute YouTube Y2 - 2025/06/18 ER -