Texto de la tesis doctoral en pdf y libre acceso
La tesis mereció la calificación de «apta», y los miembros del tribunal dejamos, bajo sobre cerrad,o nuestra recomendación acerca de su consideración de «cum laude». Se trata de una Tesis desarrollada en el marco del Doctorado en Demografía del Departamento de Geografía, Facultad de Filosofía y Letras, de la Universitat Autonoma de Barcelona. Este ciclo de doctorado fue en su día el primer título universitario oficial de España en demografía, una iniciativa más en la incansable tarea formativa, investigadora y divulgadora del Centro de Estudios Demográficos de la UAB, único centro de investigación demográfica en nuestro país.
El propio autor la resume así en el en una entrada sobre la tesis en Demo-Blog , su sitio personal (de gran interés por sus muchas aportaciones en programas de R):
One of the foremost problems in formal demography has been including information on the vital rates from both males and females in models of
population renewal and growth, the so-called two-sex problem. The two-sex problem may be conceived as a subset of the analytical problems entailed by multigroup population modeling. This dissertation characterizes the two-sex problem by means of decomposing the vital rate components to the sex-gap between the male and female single-sex stable growth rates. A suite of two-sex methods for age-structured models from the literature are presented in a standard reproducible format. A new variety of age-structure, age based on remaining years of life, is presented. Analogous models of population growth for the single-sex and two-sex cases are developed for populations structured by remaining years of life. It is found that populations structured by remaining years of life produce less sex-divergence than age-structured models, thereby reducing some of the trade-offs inherent in two-sex modeling decisions. In general, populations structured by remaining years are found to be more stable over time and closer to their ultimate model stable structures than age-structured populations. Models of population growth based on remaining-years structure are found to diverge from like-designed age-structured models. This divergence is characterized in terms of the two-sex problem and we call it the two-age problem.
Timothy Riffe is researcher in the Department of Demography at the University of California, Berkeley (USA).
Contribuciones de Tim Riffe a la programación en R para el análisis demográfico en GitHub
Apuntes de demografía 