Relative frequency

In statistics the frequency (or absolute frequency) of an event ${\displaystyle i}$ is the number ${\displaystyle n_{i}}$ of times the event occurred in an experiment or study. These frequencies are often graphically represented in histograms.

The cumulative frequency is the total of the absolute frequencies of all events at or below a certain point in an ordered list of events.

The relative frequency (or empirical probability) of an event is the absolute frequency normalized by the total number of events:

The values of ${\displaystyle f_{i}}$ for all events ${\displaystyle i}$ can be plotted to produce a frequency distribution.

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