Retraction Watch

Tracking retractions as a window into the scientific process

Archive for the ‘methodological problems’ Category

Authors retract much-debated blockchain paper from F1000

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The authors of a popular — and heavily debated — F1000Research paper proposing a method to prevent scientific misconduct have decided to retract it.

The paper was initially criticized for allegedly plagiarizing from a graduate student’s blog — and revised to try to “rectify the overlap.” But according to F1000, it is now being retracted after an additional expert identified problems with the methodology.

Today, F1000 added this editorial note to the paper:

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Written by Alison McCook

May 24th, 2017 at 12:35 pm

Author retracts nanotechnology paper over doubts about key results

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The corresponding author of a 2015 nanotechnology paper has penned a lengthy — and revealing — retraction notice, explaining why he is not certain about the findings.

In the notice, Chang Ming Li from the Institute for Clean Energy & Advanced Materials (ICEAM) at Southwest University in China, states that there is “insufficient evidence to conclusively” identify the composition of the nanowire array described in the article, which “severely undermines the validity of the reported conclusions.”

The 2015 paper has been considered “highly cited” by Clarivate Analytics’ Web of Science, formerly part of Thomson Reuters, meaning it has received a disproportionate amount of cites given its field and publication year.

Li also said that the paper — which appeared in Physical Chemistry, Chemical Physics — was “submitted and published without my knowledge or permission.” He has not responded to our request to explain how that could have happened, given that he was the corresponding author. Read the rest of this entry »

“Strange. Very strange:” Retracted nutrition study reappears in new journal

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In an unusual turn of events, a nutrition paper has come back to life a year after being pulled from its original publication.

After the paper was retracted from the journal Obesity, the authors revised it and republished it in another journal, Pediatric Obesity. Both journals are published by Wiley. The second version of the paper doesn’t mention the previous retraction. Indeed, the journal editor told us he didn’t know the paper had been retracted. Still, he stood by his decision to publish it.

The authors told us the paper was retracted after editors at Obesity raised concerns over the authors’ methodology. The authors revised the paper, adding some analysis and explanation of their methodological approach, and said the new version was accepted by peer reviewers before being published in Pediatric Obesity.

However, an outside expert who reviewed both papers for us said he thinks the authors didn’t change enough. According to Patrick McKnight, head of the Measurement, Research methodology, Evaluation, and Statistics group at George Mason University and a Statistical Advisory Board member of STATS.org:

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Written by Megan Scudellari

March 28th, 2017 at 9:30 am

Physics paper’s results off by factor of 100

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Researchers from China have retracted a physics paper after realizing an error led them to report results that were nearly 100 times too large.

What’s more, the authors omitted key findings that would enable others to reproduce their experiments.

According to the notice, the authors used a value to calculate a feature of electrons—called mobility—that “was approximately 100 times too small,” which led to results that were “100 times too large.” The notice also details several gaps in the presentation of experimental results, which preclude others from duplicating the experiments.

Here’s the retraction notice for “Bulk- and layer-heterojunction phototransistors based on poly[2-methoxy-5-(2′-ethylhexyloxy-p-phenylenevinylene)] and PbS quantum dot hybrids:” Read the rest of this entry »

When does animal research become unnecessary and cruel? A paper’s methods give a biologist pause

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Elies Bik

Microbiologist Elies Bik is well-known for applying a close eye to studies, and has spent years anonymously submitting reports on plagiarism and image duplication to journal editors. Last year, she published an analysis of work, with troubling results – that 1 in 25 biomedical papers contains inappropriate duplications in images. She’s never stopped reading papers closely, and recently flagged one on Twitter for concerns about its methodology. Although Bik is not against animal research, she said the treatments rats faced in the paper made her queasy – and didn’t seem justified. She explains her reasoning below.

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Written by Alison McCook

February 28th, 2017 at 11:45 am

“I placed too much faith in underpowered studies:” Nobel Prize winner admits mistakes

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Daniel Kahneman

Although it’s the right thing to do, it’s never easy to admit error — particularly when you’re an extremely high-profile scientist whose work is being dissected publicly. So while it’s not a retraction, we thought this was worth noting: A Nobel Prize-winning researcher has admitted on a blog that he relied on weak studies in a chapter of his bestselling book.

The blog — by Ulrich Schimmack, Moritz Heene, and Kamini Kesavan — critiqued the citations included in a book by Daniel Kahneman, a psychologist whose research has illuminated our understanding of how humans form judgments and make decisions and earned him half of the 2002 Nobel Prize in Economics.

According to the Schimmack et al blog, Read the rest of this entry »

Written by Alison McCook

February 20th, 2017 at 12:35 pm

What turned a cancer researcher into a literature watchdog?

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Jennifer Byrne

Sometime in the middle of 2015, Jennifer Byrne, professor of molecular oncology at the University of Sydney, began her journey from cancer researcher to a scientific literature sleuth, seeking out potentially problematic papers.

The first step was when she noticed several papers that contained a mistake in a DNA construct which, she believed, meant the papers were not testing the gene in question, associated with multiple cancer types.  She started a writing campaign to the journal editors and researchers, with mixed success. But less than two years later, two of the five papers she flagged have already been retracted.

When asked why she spent time away from bench research to examine this issue, Byrne told us:  Read the rest of this entry »

“Crucial experiments” missing from retracted plant study

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A 2016 study was retracted from a Frontiers journal after editors realized the authors had omitted experiments that didn’t support the hypothesis. 

Gearóid Ó Faoleán, ethics and integrity manager at Frontiers, which publishes Frontiers in Plant Science, told us:

In accordance with our complaints protocol, the Field Chief Editor led the investigation that resulted in the decision to retract the paper.

Here’s the retraction notice: Read the rest of this entry »

Authors retract two statin papers, one with problems “too extensive to revise”

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Researchers in China have retracted two 2016 papers about the possible use of a cholesterol-lowering agent to treat bleeding on the brain.

One of the retracted papers in the Journal of Neurosurgery (JNS) had multiple problems that were “too extensive to revise,” according to the lengthy retraction notice, relating to issues with authorship, data analyses, and patient enrollment. The notice is signed by first author Hua Liu of the Nanjing Medical University in China.

Liu is also the first author of another recently retracted paper in Frontiers in Neuroscience, pulled for incorrectly categorizing patients.

The JNS retraction notice begins: Read the rest of this entry »

Error-laden database kills paper on extinction patterns

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An ecologist in Australia realized a database he was using to spot trends in extinction patterns was problematic, affecting two papers. One journal issued an expression of concern, which has since turned into a retraction. So far, the other journal has left the paper untouched.

The now-retracted paper concluded that medium-sized species on islands tend to go extinct more often than large or small mammalian species. But a little over a year ago, Biology Letters flagged the paper with an expression of concern (EOC), noting “concerns regarding the validity of some of the data and methods used in the analysis.”

Now, last author Marcel Cardillo at Australian National University has come to a new conclusion about extinction patterns. A retraction notice that has replaced the EOC explains:

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