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Promoting replicability in developmental research through meta-analyses: Insights from language acquisition research

MPG-Autoren
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Bergmann,  Christina
Language Development Department, MPI for Psycholinguistics, Max Planck Society;
LSCP, Département d’études cognitives, ENS, EHESS, CNRS, PSL Research University;

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Zitation

Bergmann, C., Tsuji, S., Piccinini, P. E., Lewis, M. L., Braginsky, M. B., Frank, M. C., et al. (2018). Promoting replicability in developmental research through meta-analyses: Insights from language acquisition research. Child Development. Advance online publication. doi:10.1111/cdev.13079.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002E-77C7-9
Zusammenfassung
Previous work suggests key factors for replicability, a necessary feature for theory building, include statistical power and appropriate research planning. These factors are examined by analyzing a collection of 12 standardized meta-analyses on language development between birth and 5 years. With a median effect size of Cohen's d= 0.45 and typical sample size of 18 participants, most research is underpowered (range: 6%-99%; median 44%); and calculating power based on seminal publications is not a suitable strategy. Method choice can be improved, as shown in analyses on exclusion rates and effect size as a function of method. The article ends with a discussion on how to increase replicability in both language acquisition studies specifically and developmental research more generally.