Richard A. Atkinson

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A range of procedures in both robustness and diagnostics require optimisation of a target functional over all subsamples of given size. Whereas such combinatorial problems are extremely difficult to solve exactly, something less than the global optimum can be ‘good enough’ for many practical purposes, as shown by example. Again, a relaxation strategy embeds(More)
Systematic departures from a reference sampling scheme, such as multivariate normality, can affect all the observed ordered Mahalanobis distances (OMDs) – not just a few extreme values – causing distinctive changes to their overall pattern. Envelope OMD plots provide a useful framework against which to ‘read’ such changes, often suggestive of further,(More)
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