「華人戴明學院」是戴明哲學的學習共同體 ,致力於淵博型智識系統的研究、推廣和運用。 The purpose of this blog is to advance the ideas and ideals of W. Edwards Deming.

2015年7月27日 星期一

Cohort (statistics)

“Our women know what to do and when,” crowed Vladimir Putin, Russia’s president, after a recent uptick in the country’s fertility rate. A fall in America’s, by contrast, produced gloom. Both reactions were absurd. The conventional measure of fertility is a poor guide to how many babies people produce http://econ.st/1IpAAF0

 The Collaborative Study is an occupational cohort study of 6022 men and 1006 women of working age recruited from 27 workplaces throughout the central belt of Scotland. It took place between 1970 and 1973. The primary multiple health examination consisted of a self-administered questionnaire and a 20 minute attendance for screening at a temporary centre for a height and weight check, respiratory function test, 6 lead ECG, blood pressure, chest x-ray, and 10 ml. fasting blood plasma sample for cholesterol, triglycerides and the phenotyping of lipoproteins. The questionnaire differed from that used in the MAIN study as it included more detailed questions on lifestyle and early life.

Cohort (statistics)

From Wikipedia, the free encyclopedia
For other senses of this word, see cohort (disambiguation).
In statistics and demography, a cohort is a group of subjects who have shared a particular event together during a particular time span[1] (e.g., people born in Europe between 1918 and 1939; survivors of an aircrash; truck drivers who smoked between age 30 and 40). Cohorts may be tracked over extended periods in a cohort study. The cohort can be modified by censoring, i.e. excluding certain individuals from statistical calculations relating to time periods (e.g., after death) when their data would contaminate the conclusions.
The term cohort can also be used where membership of a group is defined by some factor other than a time-based one: for example, where a study covers workers in many buildings, a cohort might consist of the people who work in a given building.[2]
Demography often contrasts cohort perspectives and period perspectives. For instance, the total cohort fertility rate is an index of the average completed family size for cohorts of women, but since it can only be known for women who have finished child-bearing, it cannot be measured for currently fertile women. It can be calculated as the sum of the cohort's age-specific fertility rates that obtain as it ages through time. In contrast, the total period fertility rate uses current age-specific fertility rates to calculate the completed family size for a notional woman were she to experience these fertility rates through her life.

See also[edit]


  1. Jump up^ "BLS Information". Glossary. U.S. Bureau of Labor Statistics Division of Information Services. February 28, 2008. Retrieved 2009-05-05.
  2. Jump up^ Dodge, Y. (2003) The Oxford Dictionary of Statistical Terms, OUP. ISBN 0-19-920613-9

External links[edit]

  1. 仲間のグループ。特に統計で、同一の性質を持つ集団。団塊の世代など。
  1. コホートぶんせき【コホート分析】
    • ある特定の集団の行動の変化を、年齢・時代・世代(コホート)の三つの要因に注目して説明する分析手法。その集団の行動の将来予測などに使われる。





  • 人口移動がないものとみなし、一定の生存率から5年後には死亡者分だけ減少し、こうなっているはずという人口(期待人口)が得られる。
  • 「実際人口」と「期待人口」との差が人口移動(転入・転出の差)であり、人口との比率を計算すると男女別・年齢別の「移動率」が求められる。
  • これらを用いて男女別各年齢において、5年後、10年後の人口を推計する。
    • なお、出生者数については、出生者数と女子人口(幼年と高齢者を除外する)から別途、「女子子ども比率」を計算する。




ケースコントロール研究 Case-control study とコホート研究 Cohort study