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Psychol Sci. 2016 Jul;27(7):1036-42. doi: 10.1177/0956797616645672. Epub 2016 May 16.

Marginally Significant Effects as Evidence for Hypotheses: Changing Attitudes Over Four Decades.

Author information

1
Department of Psychology, University of Illinois at Urbana-Champaign.
2
Department of Psychology, University of California, Los Angeles.
3
Department of Psychology, University of Illinois at Urbana-Champaign zach.s.horne@gmail.com.

Abstract

Some effects are statistically significant. Other effects do not reach the threshold of statistical significance and are sometimes described as "marginally significant" or as "approaching significance." Although the concept of marginal significance is widely deployed in academic psychology, there has been very little systematic examination of psychologists' attitudes toward these effects. Here, we report an observational study in which we investigated psychologists' attitudes concerning marginal significance by examining their language in over 1,500 articles published in top-tier cognitive, developmental, and social psychology journals. We observed a large change over the course of four decades in psychologists' tendency to describe a p value as marginally significant, and overall rates of use appear to differ across subfields. We discuss possible explanations for these findings, as well as their implications for psychological research.

KEYWORDS:

marginal significance; methodology; null-hypothesis significance testing; open data

PMID:
27207874
DOI:
10.1177/0956797616645672
[Indexed for MEDLINE]

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