Replication—an important, uncommon, and misunderstood practice—is gaining
appreciation in psychology. Achieving replicability is important for making research …

Given that an effect size of d=. 4 is a good first estimate of the smallest effect size of interest
in psychological research, we already need over 50 participants for a simple comparison of …

Survey methodology has been and continues to be a pervasively used data-collection
method in social science research. To better understand the state of the science, we first …

Publication bias and questionable research practices in primary research can lead to badly
overestimated effects in meta-analysis. Methodologists have proposed a variety of statistical …

Concerns about the veracity of psychological research have been growing. Many findings in
psychological science are based on studies with insufficient statistical power and …

Can recent failures to replicate psychological research be explained by typical magnitudes
of statistical power, bias or heterogeneity? A large survey of 12,065 estimated effect sizes …

This initiative examined systematically the extent to which a large set of archival research
findings generalizes across contexts. We repeated the key analyses for 29 original strategic …

To what extent are research results influenced by subjective decisions that scientists make
as they design studies? Fifteen research teams independently designed studies to answer …

Psychologists are navigating an unprecedented period of introspection about the credibility
and utility of their discipline. Reform initiatives emphasize the benefits of transparency and …

Most scientific research is conducted by small teams of investigators who together formulate
hypotheses, collect data, conduct analyses, and report novel findings. These teams operate …