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Biometrika 1981 68(3):708-711; doi:10.1093/biomet/68.3.708
© 1981 by Biometrika Trust
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Miscllanea

Watson's UN2 statistic for a discrete distribution

L. S. FREEDMAN

Medical Research Council Cancer Trials Office Cambridge

A general method is given for obtaining approximate percentiles of the asymptotic distribution of Watson's UN2 for testing goodness of fit to a completely specified discrete distribution. The method is applied to a particular distribution arising in data on seasonal incidence. Monte Carlo simulations give estimates of percentiles which are generally consistent with those obtained by the approximate method. The asymptotic results approximate well for sample sizes as small as 25. The power of UN2 is estimated and compared to that of Kuiper's VN and Edwards's test.

Key Words: Distribution on a circle • Kolmogorov-Smirnov statistic • Kuiper's VN • Pearson approximation • Seasonal variation


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