Sturges rule

Sturges rule

[′stər·jəs ‚rül]
(statistics)
A rule for determining the desirable number of groups into which a distribution of observations should be classified; the number of groups or classes is 1 + 3.3 log n, where n is the number of observations.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.