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:10/29/2014)... bodies decompose, their types and numbers of bugs ... could mean the difference between a closed case ... is using a more than $866,000 U.S. Department ... examine these changing populations. The microbial communities may ... death, gender, race, socioeconomic relations and more, said ...
(Date:10/29/2014)... new research potential of the Barcode of Life ... the Biodiversity Data Journal (BDJ) ... and imported these into a human-readable text developed in ... Data were used to study the species distributions of ... subfamily. , BOLD is originally designed to support the ...
(Date:10/29/2014)... is a hormone released by the stomach and it ... as a psychoactive substance that primarily affects brain function, ... , This knowledge, combined with findings from animal studies, ... potential to stimulate alcohol craving. , Dr. Lorenzo Leggio ... that, as they had anticipated, alcohol craving was increased ...
Breaking Biology News(10 mins):MSU partners with Detroit to investigate death scenes 2Go straight and publish: From Barcode of Life Data Systems to scholarly publishing systems 2Ghrelin stimulates an appetite for drinking alcohol 2
... Iris Recognition Algorithm Detects and Compensates for ... Irregularities ... today,announced the addition of VeriEye iris recognition technology to ... VeriEye SDK features an advanced iris recognition,algorithm that rapidly ...
... Centers,Inc. announced today that the Company will provide child safety ... at the Meadowlands Sport,Complex in East Rutherford, New Jersey. The ... rides, free entertainment, games, exhibits,shopping and special promotional nights., ... Officer ...
... of Natural Science, or MNS, recently participated in a project ... world. This study the largest study of bird genetics ... evolutionary tree, but completely redrawn it. The results of this ... genetic resources collection, will be published in Science ...
Cached Biology News:New VeriEye SDK from Neurotechnology Enables Development of Reliable, Cost-effective Biometric Iris Recognition Systems 2New VeriEye SDK from Neurotechnology Enables Development of Reliable, Cost-effective Biometric Iris Recognition Systems 3AMBER Alert Safety Centers to Provide Child Safety Precautions at the New Jersey State Fair at the Meadowlands 2AMBER Alert Safety Centers to Provide Child Safety Precautions at the New Jersey State Fair at the Meadowlands 3'Early bird' project really gets the worm 2
(Date:10/30/2014)... York, NY (PRWEB) October 30, 2014 ... plan for its ICH Stability Testing and Package Test ... this investment centers on a dramatic increase in environmental ... volume of stability, storage and aging samples to be ... stage of this major capital expenditure has already taken ...
(Date:10/30/2014)... CARLSBAD, Calif. , Oct. 30, 2014 Isis ... antisense therapeutics, today announced that management will present a company ... 2014 at 8:30 a.m. ET in Boston, MA. ... will be available on the "Investors & Media" section of ... available on the Isis website within 48 hours and will ...
(Date:10/30/2014)... key challenges in the development of quantum technologies has ... a paper published today (28 October) in Nature ... to make a new type of flexibly designed microscopic ... high-precision sensors and specialised superfast computers, often depend on ... for trapping these tiny particles are hugely problematic because ...
(Date:10/27/2014)... 2014 The new research report, ... & Medium), Sub-type (Primary & Secondary), and End-User ... Transportation & Power Generation) - Trends and Forecasts ... with analysis and forecasting of the market size. ... with 52 Figures spread through 146 Pages and ...
Breaking Biology Technology:Whitehouse Labs Announces Major Capital Investment in Stability and Storage Testing Capacity 2Whitehouse Labs Announces Major Capital Investment in Stability and Storage Testing Capacity 3Isis Pharmaceuticals to Present at the Nomura Biotechnology Conference 2Gas Insulated Switchgear Market worth $21,951.9 Million by 2019 - New Report by MarketsandMarkets 2Gas Insulated Switchgear Market worth $21,951.9 Million by 2019 - New Report by MarketsandMarkets 3Gas Insulated Switchgear Market worth $21,951.9 Million by 2019 - New Report by MarketsandMarkets 4
... In a bid to increase per capita income, retain more ... the state announced Thursday a commitment of $500,000 to help ... at the University of Wisconsin-Green Bay , is part ... of the number of citizens with bachelor's degrees. Seven programs ...
... global biotechnology industry will face many serious issues over ... to the rigors of engineering better biofuels and bioproducts. ... immediately confronts the 20,000 convention visitors at BIO '06. ... , ,A walk-through in Chicago's massive McCormick Place ...
... In a marriage of complementary nanotechnology companies, ... British firm. , ,Imago announced Tuesday that it has acquired ... Polaron Plc. The purchase price was not disclosed, but the ... to president and CEO Tim Stultz. , ,The companies ...
Cached Biology Technology:State commits $500,000 to boost bachelor's degrees 2My-oh, it's BIO! Where sales hype and science collide 2Imago acquires synergistic British firm 2
Pronase Reagent...
CircuLex Anti-Human S100P Polyclonal Antibody Research Focus: proliferation Storage: -20C Shipping Temperature: 4C...
Rabbit polyclonal to ECSIT ( Abpromise for all tested applications). entrezGeneID: 51295 SwissProtID: Q96HQ7...
HAMP Immunogen: HAMP (AAH20612, 25 a.a. ~ 85 a.a) full length recombinant protein with GST tag. Storage: -20 C, Avoid Freeze/Thaw Cycles *Available for distribution in the US only...
Biology Products: