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J Epidemiol Community Health. 1980 June; 34(2): 147–149.
PMCID: PMC1052061

Exact significance levels for Hewitt's test for seasonality.


Hewitt proposed an easily computed test for seasonality in ranked monthly data. This paper provides a tabulation of the exact distribution of the test statistic, which previously could be estimated only from simulated data. The use of this test when ties may occur in the data is also discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • EDWARDS JH. The recognition and estimation of cyclic trends. Ann Hum Genet. 1961 May;25:83–87. [PubMed]
  • Walter SD. The power of a test for seasonality. Br J Prev Soc Med. 1977 Jun;31(2):137–140. [PMC free article] [PubMed]
  • Freedman LS. The use of a Kolmogorov--Smirnov type statistic in testing hypotheses about seasonal variation. J Epidemiol Community Health. 1979 Sep;33(3):223–228. [PMC free article] [PubMed]
  • Hewitt D, Milner J, Csima A, Pakula A. On Edwards' criterion of seasonality and a non-parametric alternative. Br J Prev Soc Med. 1971 Aug;25(3):174–176. [PMC free article] [PubMed]

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