ISSN: 0090-3973
Page Count: 3

The U Test for Outlier Detection in Normal Distributions with Known σ

(Received 2 August 1999; accepted 24 November 1999)

Abstract

A new criterion is proposed for testing for outliers when the population standard deviation a is known. The advantage of this criterion is that no table is required and a fixed significance level can be selected. Compared with the current ASTM E 178 criterion for outlier rejection, under the same chance of making a Type I error, the U test has less chance of making a Type II error and therefore is a more powerful test.

Keywords:
outliers, population standard deviation, Nair's statistic, powerful function, statistical criteria

Paper ID: JTE12082J
DOI: 10.1520/JTE12082J
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