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Rate (mathematics) |
A rate is a special kind of ratio, indicating a relationship between two measurements. A rate may be defined using two numbers of the same units resulting in a dimensionless quantity (for example, "1 in 10 people"), or may be defined by two different measurements with different units (for example, "metres per second" used in speed).
Often rate is a synonym of rhythm or frequency, a count per second. Examples are heart rate or sample rate.
When dealing with rates, the division operator is sometimes expressed as per. If the units are expressed without abbreviation, the bottom unit is singular. If one travels 5 meters in 2 seconds, the following rate is:
A unit rate is a rate that is simplified so it has a denominator of 1. This type of rate is frequently used when referring to statistics.citation needed
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