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An age effect is how people change as they get older. As people progress from childhood to adolescence to adulthood they go through various changes. Not only do their bodies change (as we start to lament once we hit middle age), but they change socially as well.

A cohort effect occur when a commonly aged group of people in research indirectly affect results due to their common age-related influences.An example of a cohort effect could be seen in an experiment in which participants use a computer to perform a cognitive task.

Period effects arise from events and changes happening as time passes by that affect individuals of all ages, for example: wars, famine, policy changes. Finally, cohort effects derive from differences between groups of people who go through a common initial event (e.g. birth) in the same time unit (e.g. year).

An aging effect is a change in variable values which occurs among all cohorts independently of time period, as each cohort grows older. A cohort effect is a change which characterizes populations born at a particular point in time, but which is independent of the process of aging.

An aging effect is a change in variable values which occurs among all cohorts independently of time period, as each cohort grows older. A cohort effect is a change which characterizes populations born at a particular point in time, but which is independent of the process of aging.

For example, the older people get, the more medications they take. America, as a whole, may be taking more medications because the population is getting olderan age effect.

Identification problem in APC: APC analysis aims at describing and estimating the independent effect of age, period and cohort on the health outcome under study. The different strategies used aims to partition variance into the unique components attributable to age, period, and cohort effects (4).