Frequency (statistics)
（重定向自Statistical frequency）
![Histogram of travel time (to work), US 2000 census. Histograms depict the frequencies of observations occurring in certain ranges of values](/Images/godic/202502/13/Travel_time_histogram_total_n_Stata3740.png")
![Example of a bar chart, with 'Country' as the discrete data set.](/Images/godic/202502/13/Incarceration_Rates_Worldwide_ZP.svg3740.png")
In statistics the frequency (or absolute frequency) of an event ![i](/Images/godic/202502/13/865c0c0b4ab0e063e5caa3387c1a87413740.png")
is the number ![n_i](/Images/godic/202502/13/f75ef7544498f247df440d828aee41aa3740.png")
of times the event occurred in an experiment or study. These frequencies are often graphically represented in histograms.