Why psychologists must change the way they analyze their data: the case of psi: comment on Bem (2011).

  title={Why psychologists must change the way they analyze their data: the case of psi: comment on Bem (2011).},
  author={Eric-Jan Wagenmakers and Ruud Wetzels and Denny Borsboom and Han L. J. van der Maas},
  journal={Journal of personality and social psychology},
  volume={100 3},
Does psi exist? D. J. Bem (2011) conducted 9 studies with over 1,000 participants in an attempt to demonstrate that future events retroactively affect people's responses. Here we discuss several limitations of Bem's experiments on psi; in particular, we show that the data analysis was partly exploratory and that one-sided p values may overstate the statistical evidence against the null hypothesis. We reanalyze Bem's data with a default Bayesian t test and show that the evidence for psi is weak… CONTINUE READING
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