- V -
Validity
The degree to which a measurement actually measures or detects what it is supposed to measure. .
Variable
Any characteristic or attribute that can be measured. .
Variance
A measure of the dispersion shown by a set of observations, defined by the sum of the squares of deviations from the mean, divided by the number of degrees of freedom in the set of observations. .
Vector
An animate intermediary in the indirect transmission of an agent that carries the agent from a reservoir to a susceptible host. .
Vehicle
An inanimate intermediary in the indirect transmission of an agent that carries the agent from a reservoir to a susceptible host. .
Virulence
The proportion of persons with clinical disease, who after becoming infected, become severely ill or die. .
Vital Statistics
Systematically tabulated information about births, marriages, divorces, and deaths, based on registration of these vital events.
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