And then there were 28: Two more retractions for Diederik Stapel

Achtentwintig.

That’s 28 in Dutch, and is the number of retractions so far racked up by Diederik Stapel, according to our count.

The latest two to come to our attention are in the British Journal of Social Psychology, where Stapel has already had a retraction.

Here’s one notice:

The following article from British Journal of Social Psychology, “Behavioural effects of automatic interpersonal versus intergroup social comparison” by Ernestine H. Gordijn and Diederik A. Stapel, published December 2006, has been retracted by agreement between the co-author, the journal Editors in Chief, John Dixon and Jolanda Jetten and John Wiley and Sons Ltd. The retraction has been agreed following the results of an investigation into the work of Diederik A. Stapel (https://www.commissielevelt.nl/). The Levelt Committee has determined that this article contained data that was fabricated as supplied by Diederik A. Stapel. His co-author was unaware of his actions, and not in any way involved.

Eleven other studies have cited the work, according to Google Scholar.

The other notice:

The following article from British Journal of Social Psychology, ‘It depends on how you look at it: Being versus becoming mindsets determine responses to social comparisons’ by Camille S. Johnson and Diederik A. Stapel, published online on 24 December 2010 in Wiley Online Library (http://wileyonlinelibrary.com), has been retracted by agreement between the co-author, the journal Editors in Chief, John Dixon and Jolanda Jetten and John Wiley and Sons Ltd. The retraction has been agreed following the results of an investigation into the work of Diederik A. Stapel (https://www.commissielevelt.nl/). The Levelt Committee has determined that this article contained data that was fabricated as supplied by Diederik A. Stapel. His co-author was unaware of his actions, and not in any way involved.

The study has been cited once, according to Google Scholar.

28 retractions seems like a lot. But, to quote Stapel, “It depends on how you look at it.”