Week 14: Population Data Estimation, Prediction and Forecasting.
Demographers employ several techniques in attempting to understand how populations at a future date (or at a date later than that for which data are available) will resemble or differ from their current state. These are generally classed into three categories, each of which is based on a specific set of assumptions and mathematical formulations: (1) estimation, (2) projection, and (3) forecasting. The Lessen cotain brief introduction, the following sections provide explanations of each type, in the order mentioned, along with extended mathematical derivations and illustrations using census data, current information from other sources, and formal models.