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Epidemiology Related Terms

- N -

  • Natural History Of Disease

  • The temporal course of disease from onset (inception) to resolution.

  • Necessary Cause

  • A causal factor whose presence is required for the occurrence of the effect (of disease).

  • Nominal Scale

  • Classification into unordered qualitative categories; e.g.

  • Normal Curve

  • A bell-shaped curve that results when a normal distribution is graphed.

  • Normal Distribution

  • The symmetrical clustering of values around a central location. The properties of a normal distribution include the following: (1) It is a continuous, symmetrical distribution; both tails extend to infinity; (2) the arithmetic mean, mode, and median are i

  • Numerator

  • The upper portion of a fraction.

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Epidemiology Terms

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