“Unfinished business”: Diederik Stapel retraction count rises to 53

Two more papers by Diederik Stapel — who was profiled by The New York Times Magazine this weekend — have been retracted, both in the Journal of Experimental Social Psychology.

The notice for “Hardly thinking about close and distant others: On cognitive business and target closeness in social comparison effects,” by Stapel and David Marx, and cited six times:

Frequent Retraction Watch fliers rack them up: Stapel hits 51, Lichtenthaler scores number 9

Rewards may vary

Quick updates on work by two people whose names appear frequently on Retraction Watch: Diederik Stapel and Ulrich Lichtenthaler.

Last month, we reported on the 50th retraction for Stapel. Here’s number 51 in the Journal of Experimental Social Psychology, for “The flexible unconscious: Investigating the judgmental impact of varieties of unaware perception:”

Diederik Stapel earns 33rd and 34th retractions

Two more retractions for Diederik Stapel, his 33rd and 34th, by our count.

The Journal of Experimental Social Psychology, which has been a frequent subject of Retraction Watch posts recently, has retracted “Similarities and differences between the impact of traits and expectancies: What matters is whether the target stimulus is ambiguous or mixed:”

Retraction eight appears for social psychologist Lawrence Sanna

Earlier this week, we reported on retractions six and seven , in the Journal of Experimental Social Psychology, for Lawrence Sanna, the former University of Michigan psychologist who resigned last May after questions were raised about his work. Retraction eight has now appeared, also in the JESP.

Here’s the notice for “When thoughts don’t feel like they used to: Changing feelings of subjective ease in judgments of the past:”

Retraction 32 appears for Diederik Stapel

Diederik Stapel has another retraction, his 32nd.

Here’s the notice, for “”Information to go: Fluency enhances the usability of primed information,” which first appeared in 2010 in the Journal of Experimental Social Psychology:

“Fraud committed by any social psychologist diminishes all social psychologists”: New Sanna, Smeesters retractions

Three new retractions — two of papers by Lawrence Sanna and one of work by Dirk Smeesters –  have appeared in the Journal of Experimental Social Psychology. The retractions come along with a hard-hitting piece by the journal’s editor.

In a tough soul-searching editorial called “On Fraud, Deceit, and Ethics” (unfortunately only available behind a paywall), journal editor in chief Joel Cooper writes that “Fraud committed by any social psychologist diminishes all social psychologists.” He continues:

Retraction three for Dirk Smeesters

Amid criticisms this week that his former university didn’t do all it should have to investigate his work, another paper by Dirk Smeesters has been retracted.

Here’s the notice for “The effect of color (red versus blue) on assimilation versus contrast in prime-to-behavior effects,” which appeared in The Journal of Experimental Social Psychology:

University of Michigan psychologist resigns following concerns by statistical sleuth Simonsohn: Nature

A second psychology researcher has resigned after statistical scrutiny of his papers by another psychologist revealed data that was too good to be true.

Ed Yong, writing in Nature, reports that Lawrence Sanna, most recently of the University of Michigan, left his post at the end of May. That was several months after Uri Simonsohn, a University of Pennsylvania psychology researcher, presented Sanna, his co-authors, and Sanna’s former institution, the University of North Carolina, Chapel Hill, with evidence of “odd statistical patterns.”

Simonsohn is the researcher who also forced an investigation into the work of Dirk Smeesters, who resigned last month. Last week, Yong reported that Simonsohn had uncovered another case that hadn’t been made official yet.

According to today’s story, Sanna has asked the editor of the Journal of Experimental Social Psychology — which is also retracting one of Smeesters’ papers — to retract three papers published from 2009 to 2011. These are the three he seems to have published there during that time:

Following investigation, Erasmus social psychology professor retracts two studies, resigns

Dirk Smeesters

The social psychology community, already rocked last year by the Diederik Stapel scandal, now has another set of allegations to dissect. Dirk Smeesters, a professor of consumer behavior and society at the Rotterdam School of Management, part of Erasmus University, has resigned amid serious questions about his work.

According to an Erasmus press release, a scientific integrity committee found that the results in two of Smeesters’ papers were statistically highly unlikely. Smeesters could not produce the raw data behind the findings, and told the committee that he cherry-picked the data to produce a statistically significant result. Those two papers are being retracted, and the university accepted Smeesters’ resignation on June 21.

The release also takes pains to say that the university has no reason to doubt the work of his co-authors. You can read the complete report in Dutch, with Smeesters’ co-authors’ names blacked out, in an NRC Handelsblad story.

Erasmus tells Retraction Watch that these are the two papers being retracted: