What Does a Demographer Do?

Demographics is a science that studies the quantitative characteristics of population phenomena and their relationships, the processes and patterns of population reproduction, and the trends in population development. It includes observations from three aspects: static, dynamic, and future population development trends, and researches on the quantitative characteristics of population phenomena and their internal connections. The quantitative characteristics of the population phenomenon, such as the total population size, population gender structure, age structure, industry and occupational structure, cultural structure, and ethnic structure, are known as static demographic characteristics. Demographics is not only about describing the quantitative characteristics of these demographic phenomena in isolation, but also to further explore the various internal connections of these demographic phenomena in order to reveal the nature and characteristics of a population. ^[1]

Demographics

The methodological disciplines of collecting, sorting and reflecting the state, changing process of population phenomenon and its quantitative relationship with social and economic development are described. It reveals the nature, laws and development trends of population phenomena through quantitative performance.

Since the beginning of the 20th century, with

Demographics ^[2] consists of three interconnected and interconnected parts.

Demographic survey method

Demographic ^[3] data collection methods, including censuses, recurrent population statistics, population sampling surveys and typical surveys, and other methods of collecting demographic data. These methods together constitute a complete system for collecting demographic data. They are independent and interrelated. The post-World War II census and recurrent population statistics, census and sample surveys, and recurrent population statistics and sample surveys are all used in combination.

There are two major categories for the compilation and arrangement of demographic data: manual and machine. Demographic statistics stipulates the principles and methods of aggregation and arrangement, and establishes classification and grouping systems based on the nature and quantitative relationship of demographic data, such as urban population grouping, birth rate mortality grouping, occupational classification, and so on.

Demographic Analysis Index

Demographic analysis methods. Demographic analysis is the product of a combination of statistical analysis methods and demographic phenomena, and the content is extremely extensive. In terms of analysis methods, there are comprehensive index method, average method, relative number method, analysis of variance method, correlation and regression analysis method, chart method, and mathematical model of population. From the perspective of population phenomena, there are population growth rate and trend analysis, population analysis and population composition (natural composition, economic composition, social composition) analysis, population reproduction process (fertility, death, migration) analysis, population prediction and target analysis, population and Economic, social analysis, and so on, covering all aspects of the population phenomenon. In particular, population growth strategy analysis, population aging analysis, fertility analysis, mortality and life analysis, population migration and urbanization analysis, family and marriage analysis, population employment analysis, population occupation and cultural analysis, demographic data evaluation, etc. , More prominent. In addition, population mathematical models, population micro-simulations, and indirect estimation methods are also some of the branches that are developing rapidly.