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Category: Interactions

[80] Interaction Effects Need Interaction Controls

Posted on November 20, 2019February 11, 2020 by Uri Simonsohn

In a recent referee report I argued something I have argued in several reports before: if the effect of interest in a regression is an interaction, the control variables addressing possible confounds should be interactions as well. In this post I explain that argument using as a working example a 2011 QJE paper (.htm) that…

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[57] Interactions in Logit Regressions: Why Positive May Mean Negative

Posted on February 23, 2017July 28, 2022 by Uri Simonsohn

Of all economics papers published this century, the 10th most cited appeared in Economics Letters , a journal with an impact factor of 0.5.  It makes an inconvenient and counterintuitive point: the sign of the estimate (b̂) of an interaction in a logit/probit regression, need not correspond to the sign of its effect on the…

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[17] No-way Interactions

Posted on March 12, 2014February 11, 2020 by Uri Simonsohn

This post shares a shocking and counterintuitive fact about studies looking at interactions where effects are predicted to get smaller (attenuated interactions). I needed a working example and went with Fritz Strack et al.’s  (1988, .html) famous paper [933 Google cites], in which participants rated cartoons as funnier if they saw them while holding a…

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Posts on similar topics

Interactions
  • [80] Interaction Effects Need Interaction Controls
  • [57] Interactions in Logit Regressions: Why Positive May Mean Negative
  • [17] No-way Interactions

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© 2021, Uri Simonsohn, Leif Nelson, and Joseph Simmons. For permission to reprint individual blog posts on DataColada please contact us via email..