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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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