t-Test and ANOVA for data with ceiling and/or floor effects.

Behavior Research Methods
Qimin Liu, Lijuan Wang

Abstract

Ceiling and floor effects are often observed in social and behavioral science. The current study examines ceiling/floor effects in the context of the t-test and ANOVA, two frequently used statistical methods in experimental studies. Our literature review indicated that most researchers treated ceiling or floor data as if these data were true values, and that some researchers used statistical methods such as discarding ceiling or floor data in conducting the t-test and ANOVA. The current study evaluates the performance of these conventional methods for t-test and ANOVA with ceiling or floor data. Our evaluation also includes censored regression with regard to its capacity for handling ceiling/floor data. Furthermore, we propose an easy-to-use method that handles ceiling or floor data in t-tests and ANOVA by using properties of truncated normal distributions. Simulation studies were conducted to compare the performance of the methods in handling ceiling or floor data for t-test and ANOVA. Overall, the proposed method showed greater accuracy in effect size estimation and better-controlled Type I error rates over other evaluated methods. We developed an easy-to-use software package and web applications to help researchers implement...Continue Reading

References

Nov 20, 2009·Multivariate Behavioral Research·Lijuan WangTimothy A Salthouse
Dec 1, 2011·Psychological Science·Robyn KimLadan Shams
Oct 4, 2012·The Journals of Gerontology. Series B, Psychological Sciences and Social Sciences·Andrea M PiccininScott M Hofer
Nov 16, 2014·Psychological Science·Yu-Chin Chiu, Tobias Egner
Jun 13, 2015·Psychological Science·Peter Sokol-HessnerElizabeth A Phelps
Apr 17, 2016·Child Development·Julia UlberMichael Tomasello

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