Africa & Science – Afrika & Wissenschaft – Afrique & Science

Nr. 00210- Feb. 28th, 2017 – Weekly Newspaper devoted to Science & T Pour la promotion de l'esprit scientifique en Afrique

Selon des chercheurs américains, de très nombreuses études scientifiques ne sont pas fiables

COS logoL’information nous vient des USA, où des chercheurs ont passé en revue une centaine d’études scientifiques réalisées et sont arrivées à des conclusions surprenantes: 40% des cas étudiés en psychologie livre les mêmes résultats que les recherches originales, pourtant les 270 scientifiques qui se sont lancé dans cette contre-recherche ont utilisé des protocoles identiques, des échantillons similaires.

Source:

Estimating the Reproducibility of Psychological Science

Open Science Collaboration

Abstract: Reproducibility is a defining feature of science, but the extent to which it characterizes current research is unknown. We conducted replications of 100 experimental and correlational studies published in three psychology journals using high-powered designs and original materials when available. Replication effects (Mr = .197, SD = .257) were half the magnitude of original effects (Mr = .403, SD = .188), representing a substantial decline. Ninety-seven percent of original studies had significant results (p < .05). Thirty-six percent of replications had significant results; 47% of original effect sizes were in the 95% confidence interval of the replication effect size; 39% of effects were subjectively rated to have replicated the original result; and, if no bias in original results is assumed, combining original and replication results left 68% with significant effects. Correlational tests suggest that replication success was better predicted by the strength of original evidence than by characteristics of the original and replication teams.

Citation: Open Science Collaboration. (2015). Estimating the reproducibility of psychological science. Science.

Contents

Summary Report: Read the Science article and supplementary material summarizing the results of the Reproducibility Project: Psychology.

Source: https://osf.io/ezcuj/wiki/home/

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