The chapter discusses issues that make the definition and measurement of migration a difficult field in demography and related analysis. It provides conceptual organizing frameworks to help in the identification of international and internal migrants. It deals with inflows and outflows of migrants and their net effect. It proceeds to examine various concepts related to gross and net migration, migration turnover and effectiveness and related measures. Examples of these measurements are illustrated using data from a specific country. Direct methods of estimation of migration over time are reviewed and an example is given. Indirect methods of estimation of migration using life tables are explained and demonstrated with real data. Other indirect methods are also considered. Determinants of migration are reviewed and the gravity model of migration is specified and illustrated. The concept of the centre of gravity of population is also described and its application is shown.
KeywordsLife Table Migration Rate Internal Migration Gravity Model Survival Ratio
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