[secretasiandan]

From wikipedia: https://en.wikipedia.org/wiki/Zipf's_law

Thus the most frequent word will occur approximately twice as often as the second most frequent word, three times as often as the third most frequent word, etc.: the rank-frequency distribution is an inverse relation.

[johnlbevan2]

Ah; I'd interpreted inversely proportional to mean "y = -mx" rather than "y = m / x", forgetting my GCSE maths terms :S. Thanks for the pointer.