# Frequency list

Frequency list

In computational linguistics, a frequency list is a sorted list of words (word types) together with their frequency, where frequency here usually means the number of occurrences in a given corpus. A short example could be:

 the 3789654 he 2098762 [...] king 57897 boy 56975 [...] outragious 76 [...] stringyfy 5 [...] transducionalify 1

It seems that Zipf's law holds for frequency lists drawn from longer texts of any natural language. Frequency lists are a necessary prerequisite for building of an electronic dictionary, which is by itself a prerequisite for a wide range of applications in computational linguistics.

German linguists define the "häufigkeitsklasse" (frequency class) of an item in the list using the base 2 logarithm of the ratio between its frequency and the frequency of the most frequent item. The most common item belongs to frequency class 0 (zero) and any item that is half as frequent belongs in class 1. In the example list above, the misspelled word outragious has a ratio of 76/3789654 and belongs in class 16.:$N=0.5-log_2left\left(frac\left\{ ext\left\{Frequency of this item\left\{ ext\left\{Frequency of most common item ight\right)$

* Letter frequencies
* Most common words in English
* The Long Tail

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