Demographers are perhaps best known for making population projections. 人口學家或許在人口預測上最為知名。
Cohort-component method is widely used in actual population forecasts, which is base on population component and demology principle. 在現實的人口預測中,根據人口本身變動要素和人口學原理的隊列要素法應用比較廣泛,效果良好。