Error Bar 3 Sigma
Contents |
This year we give thanks for a concept that has been particularly useful in recent times: the error bar. (We've previously given thanks for
How To Interpret Error Bars
the Standard Model Lagrangian, Hubble's Law, the Spin-Statistics Theorem, conservation of momentum, how to add error bars in origin and effective field theory.) Error bars are a simple and convenient way to characterize the expected uncertainty in
How To Calculate Error Bars
a measurement, or for that matter the expected accuracy of a prediction. In a wide variety of circumstances (though certainly not always), we can characterize uncertainties by a normal how to draw error bars by hand distribution -- the bell curve made famous by Gauss. Sometimes the measurements are a little bigger than the true value, sometimes they're a little smaller. The nice thing about a normal distribution is that it is fully specified by just two numbers -- the central value, which tells you where it peaks, and the standard deviation, which tells you how to calculate error bars in excel how wide it is. The simplest way of thinking about an error bar is as our best guess at the standard deviation of what the underlying distribution of our measurement would be if everything were going right. Things might go wrong, of course, and your neutrinos might arrive early; but that's not the error bar's fault. Now, there's much more going on beneath the hood, as any scientist (or statistician!) worth their salt would be happy to explain. Sometimes the underlying distribution is not expected to be normal. Sometimes there are systematic errors. Are you sure you want the standard deviation, or perhaps the standard error? What are the error bars on your error bars? While these are important issues, we're in a holiday mood and aren't trying to be so picky. What we're celebrating is not the concept of statistical uncertainty, but the elegant shortcut provided by the concept of the error bar. Sure, many things can be going on, and ultimately we want to be more careful; nevertheless, there's no question that the abili
CatservEvolutionBlogGreg Laden's BlogLife LinesPage 3.14PharyngulaRespectful InsolenceSignificant Figures by Peter GleickStarts
How To Plot Error Bars In Excel
With A BangStoatThe Pump HandleThe Weizmann WaveUncertain what are error bars PrinciplesUSA Science and Engineering Festival: The BlogWorld's Fair2010 World Science Festival
How To Calculate Error Bars In Physics
BlogA Blog Around The ClockAdventures in Ethics and ScienceA Good PoopAll of My Faults Are Stress RelatedAngry http://www.preposterousuniverse.com/blog/2011/11/24/thanksgiving-6/ ToxicologistApplied StatisticsArt of Science LearningA Vote For ScienceBasic Concepts in SciencebioephemeraBlogging the OriginBrookhaven Bits & BytesBuilt on FactsChaotic UtopiaChristina's LIS RantClass MCognitive DailyCommon KnowledgeCulture DishDean's CornerDeep Sea NewsDeveloping IntelligenceDispatches from the Creation WarsDot PhysicsDr. Joan Bushwell's http://scienceblogs.com/cognitivedaily/2008/07/31/most-researchers-dont-understa-1/ Chimpanzee RefugeEffect MeasureEruptionsevolgenEvolution for EveryoneEvolving ThoughtsFraming ScienceGalactic InteractionsGene ExpressionGenetic FutureGood Math, Bad MathGreen GabbroGuilty PlanetIntegrity of ScienceIntel ISEFLaelapsLife at the SETI InstituteLive from ESOF 2014Living the Scientific Life (Scientist, Interrupted)Mike the Mad BiologistMixing MemoryMolecule of the DayMyrmecosNeuron CultureNeuronticNeurophilosophyNeurotopiaNot Exactly Rocket ScienceObesity PanaceaObservations of a NerdOf Two MindsOmni BrainOn Becoming a Domestic and Laboratory GoddessOscillatorPhoto SynthesisPure PedantryRetrospectacle: A Neuroscience BlogRevolutionary Minds Think TankScience + SocietyScience After SunclipseScience is CultureScienceOnline 2010: The BlogSciencePunkScience To LifeSciencewomenSeed/MoMA SalonSee Jane ComputeShifting BaselinesSignoutSpeakeasy ScienceSpeaking Science 2.0Stranger FruitSuperbugTerra SigillataTetrapod ZoologyThe Blogger SAT ChallengeThe Book of TrogoolThe Cheerful OncologistThe Corpus CallosumThe Examining Room of Dr. CharlesThe Frontal CortexThe IntersectionThe Island of DoubtTh
Support Support Newsreader MathWorks Search MathWorks.com MathWorks Newsreader Support MATLAB Newsgroup MATLAB Central Community Home MATLAB Answers File Exchange Cody Blogs Newsreader Link Exchange ThingSpeak Anniversary Home Post A New Message Advanced Search Help MATLAB Central Community Home MATLAB Answers File Exchange Cody Blogs Newsreader Link https://www.mathworks.com/matlabcentral/newsreader/view_thread/16510 Exchange ThingSpeak Anniversary Home Post A New Message Advanced Search Help Trial software bar chart with error bars Subject: bar chart with error bars From: Kevin Murphy Date: 8 May, 2000 18:39:14 Message: 1 of 13 Reply to this message Add author to My Watch List View original format Flag as spam Does anyone know how to add error bars to a bar chart? Kevin Subject: bar chart with error bars From: John Williams Date: 9 May, 2000 12:04:40 Message: error bar 2 of 13 Reply to this message Add author to My Watch List View original format Flag as spam Kevin Murphy wrote: > > Does anyone know how to add error bars to a bar chart? with the ERRORBAR command perhaps? or are you looking for something different to what that provides? Still, it should give you a starting point. John Subject: bar chart with error bars From: Kevin Murphy Date: 8 May, 2000 19:59:14 Message: 3 of 13 Reply to error bars in this message Add author to My Watch List View original format Flag as spam I call 'bar' on a matrix, so it gives me clusters of vertical bars like this * * * ** * ** ** I want to superimpose vertical error bars on these... Subject: bar chart with error bars From: John Williams Date: 9 May, 2000 16:14:08 Message: 4 of 13 Reply to this message Add author to My Watch List View original format Flag as spam Kevin Murphy wrote: > > I call 'bar' on a matrix, so it gives me clusters of vertical bars like > this > > * > * * > ** * > ** ** > > I want to superimpose vertical error bars on these... You already know the upper/lower error bounds, and just want to draw them on the graph? I don't know the exact answer off the top of my head, but I think you would get some good ideas by looking at the file errorbar.m Have you searched the user-contributed files and "solution search" at www.mathworks.com? That's also a good source for things which you think "surely somebody has wanted to do this before"! John Subject: bar chart with error bars From: Michael Robbins Date: 9 May, 2000 05:25:03 Message: 5 of 13 Reply to this message Add author to My Watch List View original format Flag as spam I'm not sure I understand the questio