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Issue No.05 - September (1988 vol.10)
pp: 757,758,759,760,761
ABSTRACT
A test is described for multivariate normality that is useful in pattern recognition. The test is based on the Friedman-Rafsky (1979) multivariate extension of the Wald-Wolfowitz runs test. The test data are combined with a multivariate swarm of points following the normal distribution generated with mean vector and covariance matrix estimated from the test data. The minimal spanning tree of this resultant ensemble of points is computed and the count of the interpopulation edges in the minimal spanning tree is used as a test statistic. The simulation studied both the null case of the test and one simple deviation from normality. Two conclusions are made from this study. First, the test can be conservatively applied by using the asymptotic normality of the test statistic, even for small sample sizes. Second, the power of the test appears reasonable, especially in high dimensions. Monte Carlo experiments were performed to determine if the test is reliable in high dimensions with moderate sample size. The method is compared to other such tests available in the literature.<>
INDEX TERMS
trees (mathematics), interpolation, Monte Carlo methods, pattern recognition, test statistic, Monte Carlo method, multivariate normality, data set, pattern recognition, Wald-Wolfowitz, spanning tree, interpopulation, Testing, Pattern recognition, Performance evaluation, Joining processes, Statistics, Books, Research and development, Automation, Laboratories, Computer science
CITATION
"A test to determine the multivariate normality of a data set", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol.10, no. 5, pp. 757,758,759,760,761, September 1988, doi:10.1109/34.6789
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