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On Rohlf′s Method for the Detection of Outliers in Multivariate Data

✍ Scribed by C. Caroni; P. Prescott

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
510 KB
Volume
52
Category
Article
ISSN
0047-259X

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✦ Synopsis

Rohlf (1975, Biometrics 31, 93-101) proposed a method of detecting outliers in multivariate data by testing the largest edge of the minimum spanning tree. It is shown here that tests against the gamma distribution are extremely liberal. Furthermore, results depend on the correlation structure of the data if Euclidean distances are used. While the use of generalized distances might avoid this difficulty, the construction of the robust estimates required to carry out the test with generalized distances provides in itself information on outliers which leaves Rohlf's procedure superfluous. It is concluded that Rohlf's method does not provide a useful formal test. 1995 Academic Press, Inc.

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