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Epidemiology Related Terms

- R -

  • Race-Specific Mortality Rate

  • A mortality rate limited to a specified racial group. Both numerator and denominator are limited to the specified group.

  • Random Sample

  • A sample derived by selecting individuals such that each individual has the same probability of selection. .

  • Range

  • In statistics, the difference between the largest and smallest values in a distribution. In common use, the span of values from smallest to largest.

  • Rate

  • An expression of the frequency with which an event occurs in a defined population. .

  • Rate Ratio

  • A comparison of two groups in terms of incidence rates, person-time rates, or mortality rates. .

  • Ratio

  • The value obtained by dividing one quantity by another. .

  • Relative Risk

  • A comparison of the risk of some health-related event such as disease or death in two groups. .

  • Representative Sample

  • A sample whose characteristics correspond to those of the original population or reference population. .

  • Reservoir

  • The habitat in which an infectious agent normally lives, grows and multiplies; reservoirs include human reservoirs, animals reservoirs, and environmental reservoirs. .

  • Risk

  • The probability that an event will occur, e.g.

  • Risk Factor

  • An aspect of personal behavior or lifestyle, an environmental exposure, or an inborn or inherited characteristic that is associated with an increased occurrence of disease or other health-related event or condition. .

  • Risk Ratio

  • A comparison of the risk of some health-related event such as disease or death in two groups. .


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Epidemiology Terms






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