Effect sizes, statistical power and sample sizes in "The Japanese Journal of Psychology"

Yumi Suzukawa*, Hideki Toyoda

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

3 Citations (Scopus)


This study analyzed the statistical power of research studies published in the "Japanese Journal of Psychology" in 2008 and 2009. Sample effect sizes and sample statistical powers were calculated for each statistical test and analyzed with respect to the analytical methods and the fields of the studies. The results show that in the fields like perception, cognition or learning, the effect sizes were relatively large, although the sample sizes were small. At the same time, because of the small sample sizes, some meaningful effects could not be detected. In the other fields, because of the large sample sizes, meaningless effects could be detected. This implies that researchers who could not get large enough effect sizes would use larger samples to obtain significant results.

Original languageEnglish
Pages (from-to)51-63
Number of pages13
JournalShinrigaku Kenkyu
Issue number1
Publication statusPublished - 2012 Apr


  • Effect size
  • Power analysis
  • Sample size

ASJC Scopus subject areas

  • Psychology(all)


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