1. Summary
A study on the changes through population, size, distribution and composition, birth, death, migration, and social movement. The term was first used by the Guillard in 1855, which sets itself apart from the more general area of population theory by its history and characteristic methods.
The central interest in demographics is to establish reliable metrics that measure the total number of people, birth rate, marriage and death rate. In most history, and in today's world, these measurements are very problematic. The most reliable data—Census, birth, marriage and death—returned until 200 years ago. Even when data exists, there are problems of variation and the record process is designed to be difficult to interpret, especially in economically underdeveloped areas and where bureaucracy is not efficient. Evaluation of demographic trends requires reliable and long-term data, and the way in which a series of data is scaled back and back is of great importance.
Birth, death, and migration rates are too aggregated to conclude population changes, and the proportion given as is may be supplemented in various ways as a lower population within the population. Age-sex union tables and age-sex special life tables are the most important requirements, although analyses such as class, race, residence, birth history (number of children born in a woman) and birth screens are essential to produce a proper diagram, especially for social purposes. In today's society, sensors and records are supplemented by employment statistics, sample surveys, medical records, ships, and aircraft records.
2. What was interesting/What did we learn
Demography has many variables. Examples include gender, age, birth and death. I wonder how to count so many variables. Scholars will use government-recorded information to make various policies or studies based on data.
3.Discussion Point
It would be nice if the government's record is correct, but the subject of statistics makes a mistake. For example, the international community has turned out to be an aging society from 2018. But if facts and data are different, it will have a big impact on future policies, social conflicts and research. What are some precautions against these problems?
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