ranks CHILD DEVELOPMENT
as #22 of all psychology journals with an SJR-Impact-Factor
of 3.1 in 2014. At present, the replicability-report is based on articles published from 2000 to 2015. During this time, CHILD PSYCHOLOGY published 1,986 articles. The replicability-report is based on 1,555 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 7,550 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 61% 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 55% power in this range. Power for all significant results is estimated to be 69%. A power estimate of 61% implies that 61% 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 time trend shows a slight decline in power over time. The power estimates in the past three years are below the historic average. The average for the years 2010-2014 is 63%. The declining trend shows that CHILD DEVELOPMENT has not responded to the replicability crisis in psychology.