Replicability Report for DEVELOPMENTAL SCIENCE

DEVELOPMENTAL SCIENCE is published by Wiley. The journal started publishing articles in 1998.

SCImago ranks DEVELOPMENTAL SCIENCE as #21 of all psychology journals with an SJR-Impact-Factor of 3.9 in 2014. At present, the replicability report is based on articles published from 1998 to 2015. During this time, DEVELOPMENTAL SCIENCE published 1,378 articles. The replicability report is based on 959 articles that reported one or more t or F-test in the text of the results section (results reported in Figures or Tables are not included).  The test-statistic was converted into z-scores to estimate post-hoc-power.  The analysis is based on 4,953 z-scores in the range from 2 (just above the 1.96 criterion value for p < .05 (two-tailed)) to 4.

PHP-Curve DevSci
Based on the distribution of z-scores in the range between 2 and 4, the average power for significant results in this range is estimated to be 59% with the homogeneous model that is currently being used for the replicability rankings. The heterogeneous model fits the actual data better and produces an estimate of 50% power in this range.  Power for all significant results is estimated to be 65%.  A power estimate of 59% implies that 59% of the published significant results in this range are predicted to produce a significant results in an exact replication study with the same sample size and power (results with z > 4 are expected to replicate with nearly 100%).

The same method was used to estimate power for individual years.

PHP-Trend DevSciThe time trend is slightly negative. The average for the years 2010-2014 is 57%, which is close to the historic average.  The current power estimate for 2015 is 53%.  These results show that editors of DEVELOPMENTAL SCIENCE have not yet responded to the replicability crisis in psychology.

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