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Tutorials!in!Quantitative!Methods!for!Psychology! 2007,!Vol.3!(2),!p.!63"69.!
 

Summary: Tutorials!in!Quantitative!Methods!for!Psychology!
2007,!Vol.3!(2),!p.!63"69.!
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Rensselaer!Polytechnic!Institute!
!
This!paper!presents!a!graphical!way!of!interpreting!effect!sizes!when!more!than!two!
groups!are!involved!in!a!statistical!analysis.!This!method!uses!noncentral!distributions!
to! specify! the! alternative! hypothesis,! and! the! statistical! power! can! thus! be! directly!
computed.! This! principle! is! illustrated! using! the! chi"squared! distribution! and! the! F!
distribution.! Examples! of! chi"squared! and! ANOVA! statistical! tests! are! provided! to!
further!illustrate!the!point.!It!is!concluded!that!power!analyses!are!an!essential!part!of!
statistical! analysis,! and! that! using! noncentral! distributions! provides! an! argument! in!
favour!of!using!a!factorial!ANOVA!over!multiple!t!tests.!
!
!
!
Statistics!occupy!a!large!portion!of!psychological!papers.!

  

Source: Ashby, F. Gregory - Department of Psychology, University of California at Santa Barbara

 

Collections: Biology and Medicine; Computer Technologies and Information Sciences