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  2. Life table - Wikipedia

    en.wikipedia.org/wiki/Life_table

    Static life tables sample individuals assuming a stationary population with overlapping generations. "Static life tables" and "cohort life tables" will be identical if population is in equilibrium and environment does not change. If a population were to have a constant number of people each year, it would mean that the probabilities of death ...

  3. Survivorship curve - Wikipedia

    en.wikipedia.org/wiki/Survivorship_curve

    Survivorship curves can be constructed for a given cohort (a group of individuals of roughly the same age) based on a life table. There are three generalized types of survivorship curves: [ 1 ] Type I or convex curves are characterized by high age-specific survival probability in early and middle life, followed by a rapid decline in survival in ...

  4. Cohort study - Wikipedia

    en.wikipedia.org/wiki/Cohort_study

    Cohort Succession can explain most change in literature, art, intellectualism, political opinions, and phonology. [5] Shorter term studies are commonly used in medical research as a form of clinical trial, or means to test a particular hypothesis of clinical importance. Such studies typically follow two groups of patients for a period of time ...

  5. Ecological study - Wikipedia

    en.wikipedia.org/wiki/Ecological_study

    Ecological studies are particularly useful for generating hypotheses since they can use existing data sets and rapidly test the hypothesis. The advantages of the ecological studies include the large number of people that can be included in the study and the large number of risk-modifying factors that can be examined. [citation needed]

  6. Longitudinal study - Wikipedia

    en.wikipedia.org/wiki/Longitudinal_study

    Cohort studies are one type of longitudinal study which sample a cohort (a group of people who share a defining characteristic, typically who experienced a common event in a selected period, such as birth or graduation) and perform cross-section observations at intervals through time. Not all longitudinal studies are cohort studies; some ...

  7. Source–sink dynamics - Wikipedia

    en.wikipedia.org/wiki/Source–sink_dynamics

    The source–sink model of population dynamics has made contributions to many areas in ecology. For example, a species' niche was originally described as the environmental factors required by a species to carry out its life history, and a species was expected to be found only in areas that met these niche requirements. [ 18 ]

  8. Cohort (statistics) - Wikipedia

    en.wikipedia.org/wiki/Cohort_(statistics)

    Case–control study versus cohort on a timeline. "OR" stands for "odds ratio" and "RR" stands for "relative risk".In statistics, epidemiology, marketing and demography, a cohort is a group of subjects who share a defining characteristic (typically subjects who experienced a common event in a selected time period, such as birth or graduation).

  9. Theoretical ecology - Wikipedia

    en.wikipedia.org/wiki/Theoretical_ecology

    Population ecology is a sub-field of ecology that deals with the dynamics of species populations and how these populations interact with the environment. [15] It is the study of how the population sizes of species living together in groups change over time and space, and was one of the first aspects of ecology to be studied and modelled mathematically.

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