Location of multiple outliers in two-way tables, using tetrads

Dan Bradu, Douglas M. Hawkins

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Using residuals to isolate multiple outhers in a two-way table may lead to very poor results. A new diagnostic is proposed: the median of the tetrads associated with a cell. This procedure can efficiently identify multiple outliers in a single step. The use of a half-normal plot provides a good indicator of the actual number of outhers in the table.

Original languageEnglish (US)
Pages (from-to)103-108
Number of pages6
Issue number2
StatePublished - May 1982


  • Half-normal plot
  • Outhers
  • Tetrads
  • Two-way tables


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