# Basic Measurements in Epidemiology

**Rate:**

Measures the occurrence of some particular event in a population during a given time period. Comprises of a numerator, denominator, time period and multiplier. Numerator is a part of the denominator. E.g death rate, birth rate etc.**Ratio:**

Expresses a relation in size between two random quantities. Numerator is not a part of denominator and there is no specified time element. E.g. â€“ sex ratio, doctor â€“ nurse ratio.**Proportion:**

Indicates the relation in magnitude of a part to the whole. Numerator is a part of the denominator but there is no element of time. It is expressed as a percentage.

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