Demography
Demography (from
Demographic analysis examines and measures the dimensions and
Patient demographics form the core of the data for any medical institution, such as patient and emergency contact information and patient medical record data. They allow for the identification of a patient and his categorization into categories for the purpose of statistical analysis. Patient demographics include:
Formal demography limits its object of study to the measurement of population processes, while the broader field of social demography or population studies also analyses the relationships between economic, social, institutional, cultural, and biological processes influencing a population.[9]
History
Demographic thoughts traced back to antiquity, and were present in many civilisations and cultures, like Ancient Greece, Ancient Rome, China and India.[10] Made up of the prefix demo- and the suffix -graphy, the term demography refers to the overall study of population.[citation needed]
In ancient Greece, this can be found in the writings of Herodotus, Thucydides, Hippocrates, Epicurus, Protagoras, Polus, Plato and Aristotle.[10] In Rome, writers and philosophers like Cicero, Seneca, Pliny the Elder, Marcus Aurelius, Epictetus, Cato, and Columella also expressed important ideas on this ground.[10]
In the
One of the earliest demographic studies in the modern period was Natural and Political Observations Made upon the Bills of Mortality (1662) by
In 1755,
In 1855, a Belgian scholar Achille Guillard defined demography as the natural and social history of human species or the mathematical knowledge of populations, of their general changes, and of their physical, civil, intellectual, and moral condition.[17]
The period 1860–1910 can be characterized as a period of transition where in demography emerged from statistics as a separate field of interest. This period included a panoply of international 'great demographers' like
Methods
Demography is the
There are two types of data collection—direct and indirect—with several methods of each type.
Direct methods
Direct data comes from vital statistics registries that track all births and deaths as well as certain changes in legal status such as marriage, divorce, and migration (registration of place of residence). In developed countries with good registration systems (such as the United States and much of Europe), registry statistics are the best method for estimating the number of births and deaths.
A census is the other common direct method of collecting demographic data. A census is usually conducted by a national government and attempts to enumerate every person in a country. In contrast to vital statistics data, which are typically collected continuously and summarized on an annual basis, censuses typically occur only every 10 years or so, and thus are not usually the best source of data on births and deaths. Analyses are conducted after a census to estimate how much over or undercounting took place. These compare the sex ratios from the census data to those estimated from natural values and mortality data.
Censuses do more than just count people. They typically collect information about families or households in addition to individual characteristics such as age, sex, marital status, literacy/education, employment status, and occupation, and geographical location. They may also collect data on migration (or place of birth or of previous residence), language, religion, nationality (or ethnicity or race), and citizenship. In countries in which the vital registration system may be incomplete, the censuses are also used as a direct source of information about fertility and mortality; for example, the censuses of the
Indirect methods
Indirect methods of collecting data are required in countries and periods where full data are not available, such as is the case in much of the developing world, and most of historical demography. One of these techniques in contemporary demography is the sister method, where survey researchers ask women how many of their sisters have died or had children and at what age. With these surveys, researchers can then indirectly estimate birth or death rates for the entire population. Other indirect methods in contemporary demography include asking people about siblings, parents, and children. Other indirect methods are necessary in historical demography.[citation needed]
There are a variety of demographic methods for modelling population processes. They include models of mortality (including the
).The United Kingdom has a series of four national birth cohort studies, the first three spaced apart by 12 years: the 1946 National Survey of Health and Development, the 1958 National Child Development Study,[20] the 1970 British Cohort Study,[21] and the Millennium Cohort Study, begun much more recently in 2000. These have followed the lives of samples of people (typically beginning with around 17,000 in each study) for many years, and are still continuing. As the samples have been drawn in a nationally representative way, inferences can be drawn from these studies about the differences between four distinct generations of British people in terms of their health, education, attitudes, childbearing and employment patterns.[22]
Indirect standardization is used when a population is small enough that the number of events (births, deaths, etc.) are also small. In this case, methods must be used to produce a standardized mortality rate (SMR) or standardized incidence rate (SIR).[23][24]
Population change
Population change is analyzed by measuring the change between one population size to another.
Standardization of population numbers
For there to be a
Within the category of standardization, there are two major approaches: direct standardization and indirect standardization.[citation needed]
Common rates and ratios
- The crude birth rate, the annual number of live births per 1,000 people.
- The general fertility rate, the annual number of live births per 1,000 women of childbearing age (often taken to be from 15 to 49 years old, but sometimes from 15 to 44).
- The age-specific fertility rates, the annual number of live births per 1,000 women in particular age groups (usually age 15–19, 20–24 etc.)
- The crude death rate, the annual number of deaths per 1,000 people.
- The infant mortality rate, the annual number of deaths of children less than 1 year old per 1,000 live births.
- The expectation of life (or life expectancy), the number of years that an individual at a given age could expect to live at present mortality levels.
- The total fertility rate, the number of live births per woman completing her reproductive life, if her childbearing at each age reflected current age-specific fertility rates.
- The replacement level fertility, the average number of children women must have in order to replace the population for the next generation. For example, the replacement level fertility in the US is 2.11.[27]
- The gross reproduction rate, the number of daughters who would be born to a woman completing her reproductive life at current age-specific fertility rates.
- The net reproduction ratio is the expected number of daughters, per newborn prospective mother, who may or may not survive to and through the ages of childbearing.
- A stable population, one that has had constant crude birth and death rates for such a long period of time that the percentage of people in every age class remains constant, or equivalently, the population pyramid has an unchanging structure.[27]
- A stationary population, one that is both stable and unchanging in size (the difference between crude birth rate and crude death rate is zero).[27]
- Measures of centralisation are concerned with the extent to which an area's population is concentrated in its urban centres.[28][29]
A stable population does not necessarily remain fixed in size. It can be expanding or shrinking.[27]
The crude death rate as defined above and applied to a whole population can give a misleading impression. For example, the number of deaths per 1,000 people can be higher in developed nations than in less-developed countries, despite standards of health being better in developed countries. This is because developed countries have proportionally more older people, who are more likely to die in a given year, so that the overall mortality rate can be higher even if the mortality rate at any given age is lower. A more complete picture of mortality is given by a life table, which summarizes mortality separately at each age. A life table is necessary to give a good estimate of life expectancy.
Basic equation regarding development of a population
Suppose that a country (or other entity) contains Populationt persons at time t. What is the size of the population at time t + 1 ?
Natural increase from time t to t + 1:
Net migration from time t to t + 1:
These basic equations can also be applied to subpopulations. For example, the population size of ethnic groups or nationalities within a given society or country is subject to the same sources of change. When dealing with ethnic groups, however, "net migration" might have to be subdivided into physical migration and ethnic reidentification (assimilation). Individuals who change their ethnic self-labels or whose ethnic classification in government statistics changes over time may be thought of as migrating or moving from one population subcategory to another.[30]
More generally, while the basic demographic equation holds true by definition, in practice the recording and counting of events (births, deaths, immigration, emigration) and the enumeration of the total population size are subject to error. So allowance needs to be made for error in the underlying statistics when any accounting of population size or change is made.
The figure in this section shows the latest (2004) UN (United Nations) WHO projections of world population out to the year 2150 (red = high, orange = medium, green = low). The UN "medium" projection shows world population reaching an approximate equilibrium at 9 billion by 2075. Working independently, demographers at the International Institute for Applied Systems Analysis in Austria expect world population to peak at 9 billion by 2070.[31] Throughout the 21st century, the average age of the population is likely to continue to rise.
Science of population
Populations can change through three processes: fertility, mortality, and migration. Fertility involves the number of children that women have and is to be contrasted with
Migration refers to the movement of persons from a locality of origin to a destination place across some predefined, political boundary. Migration researchers do not designate movements 'migrations' unless they are somewhat permanent. Thus, demographers do not consider tourists and travellers to be migrating. While demographers who study migration typically do so through census data on place of residence, indirect sources of data including tax forms and labour force surveys are also important.[34]
Demography is today widely taught in many universities across the world, attracting students with initial training in social sciences, statistics or health studies. Being at the crossroads of several disciplines such as sociology, economics, epidemiology, geography, anthropology and history, demography offers tools to approach a large range of population issues by combining a more technical quantitative approach that represents the core of the discipline with many other methods borrowed from social or other sciences. Demographic research is conducted in universities, in research institutes, as well as in statistical departments and in several international agencies. Population institutions are part of the CICRED (International Committee for Coordination of Demographic Research) network while most individual scientists engaged in demographic research are members of the International Union for the Scientific Study of Population,[35] or a national association such as the Population Association of America in the United States,[36] or affiliates of the Federation of Canadian Demographers in Canada.[37]
Population composition
Population composition is the description of population defined by characteristics such as age,
Population composition is also a very important part of historical research. Information ranging back hundreds of years is not always worthwhile, because the numbers of people for which data are available may not provide the information that is important (such as population size). Lack of information on the original data-collection procedures may prevent accurate evaluation of data quality.
Demographic analysis in institutions and organizations
Labor market
The demographic analysis of
Turnover and in internal labor markets
People decide to exit organizations for many reasons, such as, better jobs, dissatisfaction, and concerns within the family. The causes of turnover can be split into two separate factors, one linked with the culture of the organization, and the other relating to all other factors. People who do not fully accept a culture might leave voluntarily. Or, some individuals might leave because they fail to fit in and fail to change within a particular organization.
Population ecology of organizations
A basic definition of population ecology is a study of the distribution and abundance of organisms. As it relates to organizations and demography, organizations go through various liabilities to their continued survival. Hospitals, like all other large and complex organizations are impacted in the environment they work. For example, a study was done on the closure of acute care hospitals in Florida between a particular time. The study examined effect size, age, and niche density of these particular hospitals. A population theory says that organizational outcomes are mostly determined by environmental factors. Among several factors of the theory, there are four that apply to the hospital closure example: size, age, density of niches in which organizations operate, and density of niches in which organizations are established.[citation needed]
Business organizations
Problems in which demographers may be called upon to assist business organizations are when determining the best prospective location in an area of a branch store or service outlet, predicting the demand for a new product, and to analyze certain dynamics of a company's workforce. Choosing a new location for a branch of a bank, choosing the area in which to start a new supermarket, consulting a bank loan officer that a particular location would be a beneficial site to start a car wash, and determining what shopping area would be best to buy and be redeveloped in metropolis area are types of problems in which demographers can be called upon.
Standardization is a useful demographic technique used in the analysis of a business. It can be used as an interpretive and analytic tool for the comparison of different markets.
Nonprofit organizations
These organizations have interests about the number and characteristics of their clients so they can maximize the sale of their products, their outlook on their influence, or the ends of their power, services, and beneficial works.
See also
- Biodemography
- Biodemography of human longevity
- Demographics of the world
- Demographic economics
- Gompertz–Makeham law of mortality
- Linguistic demography
- List of demographics articles
- Medieval demography
- National Security Study Memorandum 200 of 1974
- NRS social grade
- Political demography
- Population biology
- Population dynamics
- Population geography
- Population reconstruction
- Population statistics
- Religious demography
- Replacement migration
- Reproductive health
Social surveys
- Current Population Survey (CPS)
- Demographic and Health Surveys (DHS)
- European Social Survey (ESS)
- General Social Survey (GSS)
- ALLBUS)
- Multiple Indicator Cluster Surveys (MICS)
- National Longitudinal Survey(NLS)
- Panel Study of Income Dynamics (PSID)
- Performance Monitoring and Accountability 2020(PMA2020)
- Socio-Economic Panel (SOEP, German)
- World Values Survey (WVS)
Organizations
- Global Social Change Research Project (United States)
- Institut national d'études démographiques (INED) (France)
- Max Planck Institute for Demographic Research (Germany)
- Office of Population Research (Princeton University) (United States)
- Population Council (United States)
- Population Studies Center at the University of Michigan (United States)
- Vienna Institute of Demography (VID) (Austria)
- Wittgenstein Centre for Demography and Global Human Capital (Austria)
Scientific journals
- Brazilian Journal of Population Studies
- Cahiers québécois de démographie
- Demography
- Population and Development Review
References
- ^ "demography". Merriam-Webster.com Dictionary.
- ^ McFalls Jr, Joseph A. "Population: A Lively Introduction." Population Bulletin 46.2 (1991): n2. https://www.prb.org/resources/population-a-lively-introduction/
- ^ "The Science of Population". demographicpartitions.org. Archived from the original on 14 August 2015. Retrieved 4 August 2015.
- ^ "UC Berkeley Demography department website". Archived from the original on 1 September 2006. Retrieved 12 October 2006.
- ^ "Demographic Analysis" (PDF). U.S. Census Monitoring Board. Retrieved 3 October 2023.
- ^ Jean Murray. "How to Use Demographics for Business Advertising". About.com Money. Archived from the original on 6 October 2011. Retrieved 26 March 2016.
- ^ a b c US Census Bureau Webdesign: SSD, Laura K Yax, Content: DSSD, Phil Gbur, POP, Jason Devine. "Coverage Measurement". Archived from the original on 10 January 2016. Retrieved 26 March 2016.
{{cite web}}
: CS1 maint: multiple names: authors list (link) - ^ "What Are Patient Demographics?". 21 December 2011. Archived from the original on 28 January 2021. Retrieved 15 November 2020.
- ISBN 0-340-71892-7
- ^ ISBN 9788126119929.
- ^ a b c d Peter Biller,The measure of multitude: Population in medieval thought[1].
- ISBN 5-484-00414-4.
- ^ "Our Yesterdays: the History of the Actuarial Profession in North America, 1809-1979," by E.J. (Jack) Moorhead, FSA, (1/23/10 – 2/21/04), published by the Society of Actuaries as part of the profession's centennial celebration in 1989.
- ^ The History of Insurance, Vol 3, Edited by David Jenkins and Takau Yoneyama (1 85196 527 0): 8 Volume Set: (2000) Availability: Japan: Kinokuniya).
- ^ von Valtier, William F. (June 2011). ""An Extravagant Assumption": The Demographic Numbers behind Benjamin Franklin's Twenty-Five-Year Doubling Period" (PDF). Proceedings of the American Philosophical Society. 155 (2): 158–188. Archived from the original (PDF) on 5 March 2016. Retrieved 19 September 2018.
- JSTOR 984852.
- ^ Caves, R. W. (2004). Encyclopedia of the City. Routledge. p. 169.
- ^ de Gans, Henk and Frans van Poppel (2000) Contributions from the margins. Dutch statisticians, actuaries and medical doctors and the methods of demography in the time of Wilhelm Lexis. Workshop on 'Lexis in Context: German and Eastern& Northern European Contributions to Demography 1860-1910' at the Max Planck Institute for Demographic Research, Rostock, August 28 and 29, 2000.
- ^ Max Roser; Hannah Ritchie; Esteban Ortiz-Ospina; Lucas Rodés-Guirao (2013). "How long did it take for the world population to increase by one billion?". Our World in Data. Archived from the original on 13 October 2016. Retrieved 25 November 2022.
- PMID 16155052.
- PMID 16931528.
- ^ The last three are run by the Centre for Longitudinal Studies Archived 28 October 2018 at the Wayback Machine
- ^ "Direct and Indirect Standardization of Mortality Rates". Archived from the original on 3 April 2016. Retrieved 26 March 2016.
- ^ "examples of standardization" (PDF). Archived (PDF) from the original on 7 July 2017. Retrieved 16 October 2022.
- ^ "Global Population at a Glance: 2002 and Beyond" (PDF). Archived (PDF) from the original on 6 January 2022. Retrieved 16 October 2022.
- census.gov. Archived from the original(PDF) on 1 February 2022. Retrieved 3 October 2023.
- ^ a b c d Introduction to environmental engineering and science by Masters and Ela, 2008, Pearson Education, chapter 3
- ^ Hoyt, H., Forces of Urban Centralization and Decentralization, American Journal of Sociology, Vol. 46, No. 6 (May, 1941), pp. 843-852, accessed 2 July 2023
- ^ Cooper-Douglas, E., Tasmania forecast to have 79,000 more residents by 2033, with most living outside Greater Hobart, ABC News, published 5 January 2023, accessed 2 July 2023
- ^ See, for example, Barbara A. Anderson and Brian D. Silver, "Estimating Russification of Ethnic Identity Among Non-Russians in the USSR," Demography, Vol. 20, No. 4 (Nov., 1983): 461-489.
- S2CID 4306159. Archived from the original(PDF) on 16 December 2008. Retrieved 2008-11-13.
- ^ John Bongaarts. The Fertility-Inhibiting Effects of the Intermediate Fertility Variables. Studies in Family Planning, Vol. 13, No. 6/7. (Jun. - Jul., 1982), pp. 179-189.
- ^ "N C H S - Life Tables". Archived from the original on 29 July 2020. Retrieved 9 September 2017.
- ISBN 0-19-875263-6
- ^ "International Union for the Scientific Study of Population". Archived from the original on 6 September 2019. Retrieved 20 April 2008.
- ^ "Population Association of America". Archived from the original on 19 March 2011. Retrieved 14 April 2011.
- ^ "Fédération canadienne de démographie – Federation of Canadian Demographers". Archived from the original on 7 February 2023. Retrieved 7 December 2022.
Further reading
- Josef Ehmer, Jens Ehrhardt, Martin Kohli (Eds.): Fertility in the History of the 20th Century: Trends, Theories, Policies, Discourses. Historical Social Research 36 (2), 2011.
- Glad, John. 2008. Future Human Evolution: Eugenics in the Twenty-First Century. Hermitage Publishers, ISBN 1-55779-154-6
- Gavrilova N.S., Gavrilov L.A. 2011. Ageing and Longevity: Mortality Laws and Mortality Forecasts for Ageing Populations [In Czech: Stárnutí a dlouhověkost: Zákony a prognózy úmrtnosti pro stárnoucí populace]. Demografie, 53(2): 109–128.
- Preston, Samuel, Patrick Heuveline, and Michel Guillot. 2000. Demography: Measuring and Modeling Population Processes. Blackwell Publishing.
- Gavrilov L.A., Gavrilova N.S. 2010. Demographic Consequences of Defeating Aging. Rejuvenation Research, 13(2-3): 329–334.
- Paul R. Ehrlich (1968), The Population Bomb Controversial Neo-Malthusianist pamphlet
- Leonid A. Gavrilov & Natalia S. Gavrilova (1991), The Biology of Life Span: A Quantitative Approach. New York: Harwood Academic Publisher, ISBN 3-7186-4983-7
- ISBN 5-484-00414-4 [2]
- Uhlenberg P. (Editor), (2009) International Handbook of the Demography of Aging, New York: Springer-Verlag, pp. 113–131.
- Paul Demeny and Geoffrey McNicoll (Eds.). 2003. The Encyclopedia of Population. New York, Macmillan Reference USA, vol.1, 32-37
- Phillip Longman (2004), The Empty Cradle: how falling birth rates threaten global prosperity and what to do about it
- Sven Kunisch, Stephan A. Boehm, Michael Boppel (eds) (2011). From Grey to Silver: Managing the Demographic Change Successfully, Springer-Verlag, Berlin Heidelberg, ISBN 978-3-642-15593-2
- Joe McFalls (2007), Population: A Lively Introduction, Population Reference Bureau [3] Archived 1 June 2013 at the Wayback Machine
- ISBN 1-56663-606-X
- Perry, Marc J. & Mackun, Paul J. Population Change & Distribution: Census 2000 Brief. (2001)
- Preston, Samuel; Heuveline, Patrick; and Guillot Michel. 2000. Demography: Measuring and Modeling Population Processes. Blackwell Publishing.
- Schutt, Russell K. 2006. "Investigating the Social World: The Process and Practice of Research". SAGE Publications.
- Siegal, Jacob S. (2002), Applied Demography: Applications to Business, Government, Law, and Public Policy. San Diego: Academic Press.
- ISBN 1-56663-606-X
External links
- Quick demography data lookup (archived 4 March 2016)
- Demography at Curlie
- Historicalstatistics.org Links to historical demographic and economic statistics
- United Nations Population Division: Homepage
- World Population Prospects, the 2012 Revision, Population estimates and projections for 230 countries and areas (archived 6 May 2011)
- World Urbanization Prospects, the 2011 Revision, Estimates and projections of urban and rural populations and urban agglomerations
- Probabilistic Population Projections, the 2nd Revision, Probabilistic Population Projections, based on the 2010 Revision of the World Population Prospects (archived 13 December 2012)
- Java Simulation of Population Dynamics.
- Basic Guide to the World: Population changes and trends, 1960–2003
- Brief review of world basic demographic trends
- Family and Fertility Surveys (FFS)