The Use of Hypothetical Cohorts in Estimating Demographic Parameters under Conditions of Changing Fertility and Mortality

The indirect methods of demographic estimation available to date are often inadequate to estimate levels in the presence of trends. The use of measures relative to hypothetical cohorts to minimize the effectsoftrends and estimate period levels is described. Procedures allowing the estimation of intersurvey levels of fertility, child mortality and adult mortality are illustrated using data from Thailand and Peru.