Colloquy: Should familywise alpha be adjusted? Against familywise alpha adjustment

Daniel J. O'Keefe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

121 Scopus citations


Type I error is a risk undertaken whenever significance tests are conducted, and the chances of committing a Type I error increase as the number of significance tests increases. But adjusting the alpha level because of the number of tests conducted in a given study has no principled basis, commits one to absurd beliefs and practices, and reduces statistical power. The practice of requiring or employing such adjustments should be abandoned.

Original languageEnglish (US)
Pages (from-to)431-447
Number of pages17
JournalHuman Communication Research
Issue number3
StatePublished - Jul 2003

ASJC Scopus subject areas

  • Communication
  • Developmental and Educational Psychology
  • Anthropology
  • Linguistics and Language


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