WIC Online Colloquium ********************* Annette Baudisch & Jesús-Adrián Alvarez, Interdisciplinary Centre on Population Dynamics Born Once, Die Once: Lifetable Relationships for Fertility Tuesday, March 9th, 14:00-15:00 (CEST) Please register for the presentation here until one day before the presentation 10:00 (CEST): <https://www.oeaw.ac.at/vid/events/calendar/wic-colloquium/registration/> https://www.oeaw.ac.at/vid/events/calendar/wic-colloquium/registration/ Login information will be sent to registered participants the day before the presentation. Abstract Everyone dies, once. This basic truth empowers formal mortality research. Similarly, everyone is born, once. This truth has not been fully exploited to benefit formal fertility research. Baudisch and Stott (2019) recently advanced the idea of an offspring population - yet unborn awaiting the event of birth, introducing a novel survivorship concept for birth. Formalizing the idea of birth survival, here we define the underlying random variable and derive the central triplet of survival analysis functions - the hazard, density, and survival. We derive a straightforward framework to capture age-specific patterns of birth, analogous to classical life table functions. Based on age-specific birth counts, we construct a birth table and meaningful summary measures such as birth expectancy and associated measures of spread. We advance a new framework to compare birth schedules across populations and to reveal macrolevel patterns and constraints. Our approach enables method transfer from mortality to fertility research, which can create an integrated framework to study birth and death for the same focal individual. Thereby, insights into the intertwined relationships between birth and death become possible. This, we envision, will open an entirely unexplored line of research. More Information: https://www.oeaw.ac.at/fileadmin/subsites/Institute/VID/PDF/Colloquium/2021 /Online_Colloquium_Announcement_Baudisch.pdf __________________________________