SCImago ranks DEVELOPMENTAL PSYCHOLOGY as #37 of all psychology journals with an SJR-Impact-Factor of 2.5 in 2014. At present, the replicability-report is based on articles published from 1999 to 2015. During this time, DEVELOPMENTAL PSYCHOLOGY published 2,063 articles. The replicability-report is based on 1,641 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 7,297 z-scores in the range from 2, just above the 1.96 criterion value for p < .05 (two-tailed), to 4.
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 63%. This estimate suggests that 63% 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.
The results show a small linear increase over time. However, power increased and decreased over the 16 year period. In the past 5 years, power increased. The replicability score in 2015 was 76%, which is the highest score on record and a high score relative to other journals in 2015. Future data will show whether DEVELOPMENTAL PSYCHOLOGY can build on the positive trend over the past years.