Zipf's law
Zipf's law () is an empirical law stating that when a set of measured values is sorted in decreasing order, the value of the n-th entry is often approximately inversely proportional to n. The best-known instance of Zipf's law applies to the frequency distribution of words in a text or corpus of natural language: w o r d f r e q u e n c y ∝ 1 w o r d r a n k .