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1854 G. Boole Investig. Laws Thought xvii. 268 For if we substitute..we shall form the expression of that event whose probability constitutes the numerator of c, and the ratio of the frequency of this event to that of the former one..will give the value of c.

1857 London, Edinb. & Dublin Philos. Mag. 4th Ser. 14 61 I have commenced collecting statistics showing the relative frequency with which the different simple letters, and various compounds of simple letters, occur in the English language.

1875 F. Galton in London, Edinb. & Dublin Philos. Mag. 4th Ser. 49 37 We may work backwards, and, from the relative frequency of occurrence of various magnitudes, derive a knowledge of the true relative values of those magnitudes, expressed in units of probable error.

1937 L. H. C. Tippett Methods of Statistics (ed. 2) i. 28 Frequencies and proportionate frequencies underlie nearly all methods of statistical representation.

1943 M. G. Kendall Adv. Theory Statistics I. vii. 165 The second approach seeks to define probability in terms of the relative frequency of events.

1950 W. Feller Introd. Probability Theory I. i. 18 The frequency of multiple aces in the hands at bridge.

1955 M. Loève Probability Theory i. 5 In a game of dice..‘double-six’ occurs about once in 36 times, that is, its observed frequencies cluster about 1/36. The number 1/36 is a permanent numerical property of ‘double-six’ under the conditions of the game, and the observed frequencies are to be thought of as measurements of the property.

1965 A. H. Roberts Statistical Ling. Anal. Amer. Eng. v. 60 These 8,103 words had a total frequency of 10,503,788 or ⅔ of the total frequencies of occurrence.