Navigation Links
The importance of (experimental) design
Date:2/25/2014

evolution? tienne Danchin of the University of Toulouse and Richard Wagner of the Vetmeduni's Konrad Lorenz Institute of Ethology wondered whether the results might not be influenced too much by the experimental design. Together with ric Wajnberg, a modelling specialist at the INRA in Sophia Antipolis, they simulated the data in the original paper and found that the results could be generated by chance.

The problem stems largely from the fallacy known as "regression to the mean" (RTM), which was first identified by Sir Francis Galton, a cousin of Charles Darwin, in the 19th century. It results from the fact that uncommonly large or small measurements are generally followed by more normal measurements simply because normal values are by definition far more common than extreme ones. In the Browns' experiment, when individuals are fostered from small to large colonies they will on average recruit to colonies that are statistically smaller than their foster colony because these are closer to the mean colony size and vice versa.

Danchin and Wagner actually found a second problem with the original data analysis. The so-called "spatial fallacy" was discovered by Arie van Noorwijk in 1984 and occurs when the set of potential dispersal sites differs among individuals according to where they were born. Together the two fallacies can account for the experiment's results, even in the absence of an inherited component of the selection of colony size.

A question of design

The latest calculations are important for two reasons. First, they call the original conclusions into question and should thus encourage researchers to reconsider the role of genetic factors in certain behavioural decisions. Secondly, they sound a clear warning to all those working in behavioural science. As Wagner says, "The biggest shock is that the very experimental design that is widely used to control for all extraneous effects actually creates the RTM f
'/>"/>

Contact: Richard Wagner
richard.wagner@vetmeduni.ac.at
43-148-909-15831
University of Veterinary Medicine -- Vienna
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. EU-funded study underlines importance of Congo Basin for global climate and biodiversity
2. Study sheds new light on importance of human breast milk ingredient
3. Differences between human twins at birth highlight importance of intrauterine environment
4. Programming cells: The importance of the envelope
5. Video study shows which fish clean up coral reefs, showing importance of biodiversity
6. Gene discovery reveals importance of eating your greens
7. National survey highlights perceived importance of dietary protein to prevent weight gain
8. Emerging importance of computerized cognitive testing -- new therapies for dementia
9. Researchers have identified a novel immunological mechanism of great importance for vaccine developm
10. Keck award enables Carnegie Mellon and Stanford to dramatically expand crowdsourced RNA design
11. Report presents designs for study of cancer risks near US nuclear facilities
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
The importance of (experimental) design
(Date:12/15/2014)... --Research and Markets ( http://www.researchandmarkets.com/research/87pph8/global_facial ) ... Facial Recognition Market 2015-2019" report to their ... Facial recognition is a technology used ... measures the overall facial feature of a person ... distance between eyes. Facial recognition is used for ...
(Date:12/11/2014)... 10, 2014  That blood pressure plays a role in ... – the medical term for high blood pressure – was ... the inflatable cuff that,s used in measuring blood pressure was ... nothing new about hypertension, its triggers and its effects. In ... condition and the best ways to treat it. ...
(Date:12/10/2014)...  Valencell, a leader in performance biometric data sensor ... from its licensees for highly accurate, clinically validated biometric ... coming from fitness and health sectors, but first responders/military ... is only as useful as the biometric data it ... in long-term mass consumer adoption of wearable products," said ...
Breaking Biology News(10 mins):Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 2Global Facial Recognition Market 2015-2019: Key Vendors are 3M Cogent, Cognitec Systems, NEC and Safran Group 3Research points to need for new approaches to treatment of high blood pressure 2Research points to need for new approaches to treatment of high blood pressure 3Research points to need for new approaches to treatment of high blood pressure 4Wearable Technology Products Demand Highly Accurate Biometric Technology 2
... Bethesda, MD This FASEB Science Research Conference brings ... define how the conformations of cellular proteins are achieved ... aberrant protein conformations arise. Specific sessions ... pathways, the mechanisms of action of molecular chaperones, pathways ...
... JUPITER, FL, January 22, 2013 How aging affects ... that makes it more difficult to treat a range ... A new study from the Florida campus of The ... affects the brain,s neural circuitry, in some cases significantly ...
... accurate information about endangered bats, birds and insects. A new ... revealed many previously unknown and highly valuable details about bats. ... in tents for several days with binoculars and infrared cameras ... system, which for two months has continuously recorded bat activity ...
Cached Biology News:Scripps Florida scientists offer new insight into neuron changes brought about by aging 2New monitoring technique reveals endangered animals 2New monitoring technique reveals endangered animals 3
(Date:12/19/2014)... 2014 iLab Solutions, the global leader ... Siri Bryant as the new Director of Institutional Implementations ... Implementations. These two new leadership positions were created to ... ensuring that iLab continues to meet the needs of ... years, iLab has been deployed at over 450 core ...
(Date:12/19/2014)... , Dec. 18, 2014  Decision Resources Group finds ... biomaterial market will grow moderately through 2023 as the ... growing awareness of dental biomaterials all spur procedure volumes. ... as China and ... dental procedures within reach for a larger proportion of ...
(Date:12/17/2014)... 16, 2014 The Activated Carbon ... which is why IBISWorld updated its original industry research ... benefit from an intensified focus on environmental policy. Over ... emission standards for power plants and a range of ... IBISWorld Industry Analyst Sarah Kahn, “a range of downstream ...
(Date:12/17/2014)... Ipsen Biopharmaceuticals, Inc., an affiliate ... IPSEY), today announced that Somatuline® Depot® (lanreotide) ... approved by the U.S. Food and Drug Administration ... (GEP-NETs) in adult patients with unresectable, well or ... improve progression-free survival (PFS). , “The approval of ...
Breaking Biology Technology:iLab Solutions Announces Two New Leadership Positions to Meet the Needs of Its Growing Customer Base 2Asia Pacific Dental Biomaterial Market Will Grow Strongly Through 2023 2Asia Pacific Dental Biomaterial Market Will Grow Strongly Through 2023 3Activated Carbon Manufacturing in the US Industry Market Research Report Has Been Updated from IBISWorld 2Activated Carbon Manufacturing in the US Industry Market Research Report Has Been Updated from IBISWorld 3Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 2Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 3Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 4Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 5Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 6Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 7Ipsen Announces the FDA Approval of Somatuline® Depot® (lanreotide) Injection for the Treatment of Gastroenteropancreatic Neuroendocrine Tumors 8
... one of the best possible technologies for providing ... to power our civilization. However, for this dream to ... inexpensive elements using low-cost, less energy-intensive processing chemistry, and ... electricity. A team of researchers with the U.S. Department ...
... SynCardia Systems, Inc. ( www.syncardia.com ), manufacturer of the SynCardia ... company pages on Facebook , Twitter and ... about the world,s only FDA, Health Canada and CE (Europe) ... implants of the Total Artificial Heart, accounting for more than ...
... 31, 2011 BioMed Realty Trust, Inc. (the "Company") ... of the 4.50% Exchangeable Senior Notes due 2026 (CUSIP ... Realty, L.P. (the "Operating Partnership"), which are fully and ... surrender their Notes for purchase by the Operating Partnership ...
Cached Biology Technology:Down to the wire 2Down to the wire 3Down to the wire 4SynCardia Goes Social on Facebook, Twitter and LinkedIn 2SynCardia Goes Social on Facebook, Twitter and LinkedIn 3SynCardia Goes Social on Facebook, Twitter and LinkedIn 4BioMed Realty Announces Repurchase at Option of Holders and Redemption of 4.50% Exchangeable Senior Notes Due 2026 2BioMed Realty Announces Repurchase at Option of Holders and Redemption of 4.50% Exchangeable Senior Notes Due 2026 3BioMed Realty Announces Repurchase at Option of Holders and Redemption of 4.50% Exchangeable Senior Notes Due 2026 4BioMed Realty Announces Repurchase at Option of Holders and Redemption of 4.50% Exchangeable Senior Notes Due 2026 5
Mouse monoclonal antibody raised against a partial recombinant QARS. NCBI Entrez Gene ID = QARS...
96-well format (For processing samples on microplate-size MALDI target plates such as those from Bruker, Shimadzu, Thermo, and PerkinElmer) Packaging: 2 / pack...
... mixing devices. Stepping motors device is maintenance ... durable shaker to provide a uniform motion ... nature. Regulated action scale for all modes. ... control time, continuous time, action scale and ...
Mouse monoclonal antibody raised against a partial recombinant STAU2. NCBI Entrez Gene ID = STAU2...
Biology Products: