Population pyramid

A state benefit or creation write is detailed diagram referring to the shape of the graphs which demonst outranks the composition of a countrys universe in relation to various age groups and sex (cohorts). It contains twain posture-to-side placed graphs, one that shows details of the young-begetting(prenominal) seg ment of the creation, and the opposite that shows details of the distaff section of the population. Usu on the wholey the left hand side shows details of the male segment of the population. A population profile is normally triangular in shape, the base suggesting a large number of children. A rapid narrowing of the top bands suggests that people may be expiry faster. The population pyramid provides a lot of other details such as own rate, termination rate, and life-expectancy. The pyramid should be ideally regular to demonstrate analogous pattern and numbers between males and effeminates in the nation.A population pyramid of a nation is of different typ es depending on several factors such as birth rates, death rates, and situation prevailing in the country. These take on a unmoving pyramid, progressive pyramid and regressive pyramid. A stationary pyramid demonstrates a rather constant pattern of fertility and death rate. A progressive pyramid demonstrates a high turnover of the population (elevated birth and death rates), and a large number of children. A regressive pyramid on the other hand suggests a dropping birth rate and a low fatality rate. Some countries may receive a youth bulge in their population pyramid (a near in the youth segment of the population), which may increase the risk for war terrorism and criminal activities to flourish (Answers.Com. 2006).During a war situation, a nations population pyramid may have varying appearances depending on the manner in which it is demanded.The most active segment of the population, that is young men cohort, are normally the most affected during a war. Due to strict losses, nations often demonstrate a drop in the bar graphs in the adult male cohort group, and excess in the corresponding effeminate segment. Losses of young and middle-aged men later tend to affect other portions of the population profile. The birth rate on both the male and the female side would significantly reduce over a finis of time. As this cohort of adult males get old, the excess on the female side and the deficiency in the male side starts climbing. In the 1965 population pyramid of the United Kingdom, it was seen that the number of middle-aged and elderly men were lessen, compared to the similar female cohort due to losses during the World War (Answers.Com. 2006).Sometimes, during a war situation, there may be equivalent loss on the adult female cohort side due to frequent deaths arising from childbirth, reduced healthcare facilities, sporadic violence, etc. Such a population pyramid appears symmetric with a mental picture of cohorts on the adult male and female side. This is known as a constrictive pyramid. The birth rate and the fertility rates also drop due to a diminish in women and men having a high potential for reproduction. The population pyramids of the US during the 1940s show this kind of a pattern as usually the adult population was affected, playing a role in the demurral of the nation. Over a period of time this cohort climbed as it got older (Rosenberg, Matt. 1997).When a country is affected with a full blown war, all the segments of the population seem to be affected. All the cohorts tend to get down(p). The mortality rates increases, whereas the birth rate of the population decreases. In some countries, the depression may be greater in the young adult segment of the population as they tend to be more involved with the war. These depressed cohorts tend to carry over with time as the population gets older. The population pyramid of Japan during the 1940s shows this kind of a pattern, as civil populations were also affected (Statist ical Handbook of Japan. 2006).ReferencesAbout.Com. commonwealth Pyramid. Encyclopedia of Public Health. 2006. Answers.Com. 29 Dec. 2006. http//www.answers.com/topic/population-pyramidRosenberg, Matt. Age-Sex Pyramids. About Geography. 1997. About.Com. 29 Dec. 2006. http//geography.about.com/library/weekly/aa071497.htmStatistical Handbook of Japan. Chapter 2 Population. Statistics Bureau. 2006. Statistics Bureau of Japan. 29 Dec. 2006. http//www.stat.go.jp/English/data/handbook/c02cont.htmUS enumerate Bureau. IDB Population Pyramids. U.S. Census Bureau Population Division/International Programs Center. 2006. US Census Bureau. 29 Dec. 2006. http//www.census.gov/ipc/www/idbpyr.html