At present, the replicability-report is based on articles published from 1999 to 2015. During this time, PSBP published 2,141 articles. The replicability-report is based on 1,653 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 11,426 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 51%. This estimate suggests that only half 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 mild decrease in power over time. There is no evidence that the replicability crisis in psychology has led to an increase in power in the past years. The replicability score in 2015 is 50. Based on this score JPSP:IRGP currently ranks 17 out of 27 journals in psychology. This ranking is subject to change when more data from articles in 2015 become available and more journals are included in the ranking.