It is common for researchers running replications to set their sample size assuming the effect size the original researchers got is correct. So if the original study found an effect-size of d=.73, the replicator assumes the true effect is d=.73, and sets sample size so as to have 90% chance, say, of getting a significant…
[3] A New Way To Increase Charitable Donations: Does It Replicate?
A new paper finds that people will donate more money to help 20 people if you first ask them how much they would donate to help 1 person. This Unit Asking Effect (Hsee, Zhang, Lu, & Xu, 2013, Psychological Science) emerges because donors are naturally insensitive to the number of individuals needing help. For example,…
[2] Using Personal Listening Habits to Identify Personal Music Preferences
Not everything at Data Colada is as serious as fraudulent data. This post is way less serious than that. This post is about music and teaching. As part of their final exam, my students analyze a data set. For a few years that data set has been a collection of my personal listening data from…
[1] "Just Posting It" works, leads to new retraction in Psychology
The fortuitous discovery of new fake data. For a project I worked on this past May, I needed data for variables as different from each other as possible. From the data-posting journal Judgment and Decision Making I downloaded data for ten, including one from a now retracted paper involving the estimation of coin sizes. I created…