Geodesic
A new test for unimodality
Teoriâ slučajnyh processov, Tome 14 (2008) no. 1, pp. 1-6

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A distribution function (d.f.) of a random variable is unimodal if there exists a number such that d.f. is convex left from this number and is concave right from this number. This number is called a mode of d.f. Since one may have more than one mode, a mode is not necessarily unique. The purpose of this paper is to construct nonparametric tests for the unimodality of d.f. based on a sample obtained from the general population of values of the random variable by simple sampling. The tests proposed are significance tests such that the unimodality of d.f. can be guaranteed with some probability (confidence level).
Keywords: Unimodality, distribution function, significance test. 
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Roman I. Andrushkiw; Dmitry A. Klyushin; Yuriy I. Petunin. A new test for unimodality. Teoriâ slučajnyh processov, Tome 14 (2008) no. 1, pp. 1-6. http://geodesic.mathdoc.fr/item/THSP_2008_14_1_a0/