A statistical-test-complemented graphical method for detecting multiple outliers in two-way tables |
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Authors: | Wing-Kam Fung |
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Institution: |
a Department of Statistics, University of Hong Kong, |
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Abstract: | A statistic Rk which has a simple relationship with Qk is proposed for the analysis of outliers in two-way tables and the rationale is discussed. The critical values of the test statistic, minimum Rk, can be well approximated by existing values based on univariate Grubbs-type outlier test statistics. The test statistics are complemented with plots of the largest Wk values, which have a simple monotonic inverse relationship with the values of Rk, against their expected quantiles which are approximated using a conditional independence argument. Two examples are analysed with satisfactory results. |
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