How to test the significant difference between measured value ...
文章推薦指數: 80 %
You could either shift your data to have zero mean (ie subtract the expected mean from your data points) or in MATLAB use ttest(x,m) where x ... Home Public Questions Tags Users Companies Collectives ExploreCollectives Teams StackOverflowforTeams –Startcollaboratingandsharingorganizationalknowledge. CreateafreeTeam WhyTeams? Teams CreatefreeTeam Collectives™onStackOverflow Findcentralized,trustedcontentandcollaboratearoundthetechnologiesyouusemost. LearnmoreaboutCollectives Teams Q&Aforwork Connectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch. LearnmoreaboutTeams Howtotestthesignificantdifferencebetweenmeasuredvaluematlab? AskQuestion Asked 1year,1monthago Modified 1year,1monthago Viewed 243times 0 New!Savequestionsoranswersandorganizeyourfavoritecontent.Learnmore. IhaveanOutputsampleforelectroniccomponentsandIwouldliketoknowthep-valueforrobustmysystemis.Ideally,Iwouldliketogetap-value(P<0.05)toprovethatmysystemcanconstantlyproducethesameresults.Noting,mydatasamplesaresmall. MyOutput: sample=[2.180213,2.178298,2.310851,2.114255,3.012553,2.69234,2.079787]; Itriedusing: [h,p]=chi2gof(sample,'CDF',pd) [h,p,ci,stats]=ttest(x) [h,p,stats]=fishertest(x) [h,p,ksstat,cv]=kstest(___) Iamlost!whatkindoftestdoIperformonMATLABtotrulytesthowclosemyoutputsarefromeachotherandhowconsistentmysystemoutputis(usingp-value)? Edit: Itriedthis: sample=[2.180213,2.178298,2.310851,2.114255,3.012553,2.69234,2.079787]; n=numel(sample); xobs=mean(sample);%Samplemean s=std(sample);%Samplestandarddeviation [h,p]=ttest(sample,xobs) Theresultis: h= 0 p= 1 Mynumbersarekindofclosetoeachotherbuttheresultsdonotmakesense.h=0meansthatthemeanistrueandnotrejected,butthep-valueis1!Whyisithigh! matlabp-valueconsistencyhypothesis-test Share Improvethisquestion Follow editedSep15,2021at23:10 AnwarElhadad askedSep15,2021at20:21 AnwarElhadadAnwarElhadad 111bronzebadge 8 1 Unlessyouarecomparingtwosamples(setofobservations).Inyourquestionyouhaveonesampleconsistingof7observations.Youcouldcomputestandard-deviation(std)orstandard-error(togetasenseofvariability).However,withasinglesampleyoucouldtestthehypothesisthatthesamplemeanusinga1-samplet-test. – AzimJ Sep15,2021at21:22 Ithoughtthe1-samplet-testisforwhenthedatainxcomesfromanormaldistributionwithameanequaltozero.however,mymeanisnotzero@AzimJ – AnwarElhadad Sep15,2021at21:58 yesthegeneric1-samplet-testassumesameanofzero.Youcouldeithershiftyourdatatohavezeromean(iesubtracttheexpectedmeanfromyourdatapoints)orinMATLABusettest(x,m)wherexisyoursampleandmtheexpectedmean(mathworks.com/help/stats/ttest.html-seettest(x,m)fortestingnon-zeromean).Thedatastillneedstocomefromanormallydistributedpopulation. – AzimJ Sep15,2021at22:51 Youaretestingwhetheryourdatacomesfromanormaldistributionwithmeanxobs,whichitlookslikebecauseyoudeterminedxobsfromyoursamples.Thatistosay,yourtestmakesnosense.Ihighlysuggestyoustudystatisticsbeforeyourandomlyapplystatisticaltestswithoutknowingwhattheymean.Notethatapplyingatestandgettingap<0.05provesnothing.Thetesttellsyouwhetheryoucanorcannotdiscardyourhypothesis.It’snotaproof,it’sevidence. – CrisLuengo Sep15,2021at23:22 1 Theonlythingyoucandowithyourdataiscomputeameanandastandarddeviation,anddetermineifyourmeaniscloseenoughtotheexpectedmean,andyourstandarddeviationissmallenoughforyourrequirements.Oryoucanseeifthere’satrendinthedata(meanvaluechangesovertime).Ifyoumustapplyastatisticaltest,youcancompareyourdatatoanexpecteddistribution.Butitlookslikeyoudon’thaveoneofthose,youdon’tevenknowwhatmeanyouexpect? – CrisLuengo Sep15,2021at23:26 | Show3morecomments 1Answer 1 Sortedby: Resettodefault Highestscore(default) Trending(recentvotescountmore) Datemodified(newestfirst) Datecreated(oldestfirst) 0 IbelieveIfiguredItout.IselectedanarbitrarymeanwhichismydesiredvaluetooutputtedIdeallyanduseitasthehypothesiscondition. sample=[2.180213,2.178298,2.310851,2.114255,3.012553,2.69234,2.079787]; n=numel(sample); xobs=mean(sample);%Samplemean s=std(sample);%Samplestandarddeviation [h,p]=ttest(sample,3) Share Improvethisanswer Follow answeredSep16,2021at0:22 AnwarElhadadAnwarElhadad 111bronzebadge Addacomment | YourAnswer ThanksforcontributingananswertoStackOverflow!Pleasebesuretoanswerthequestion.Providedetailsandshareyourresearch!Butavoid…Askingforhelp,clarification,orrespondingtootheranswers.Makingstatementsbasedonopinion;backthemupwithreferencesorpersonalexperience.Tolearnmore,seeourtipsonwritinggreatanswers. Draftsaved Draftdiscarded Signuporlogin SignupusingGoogle SignupusingFacebook SignupusingEmailandPassword Submit Postasaguest Name Email Required,butnevershown PostYourAnswer Discard Byclicking“PostYourAnswer”,youagreetoourtermsofservice,privacypolicyandcookiepolicy Nottheansweryou'relookingfor?Browseotherquestionstaggedmatlabp-valueconsistencyhypothesis-testoraskyourownquestion. TheOverflowBlog Privacy-friendlymachinelearningdatasets:syntheticdata Bewarethescammersposingastechrecruiters(Ep.497) FeaturedonMeta BookmarkshaveevolvedintoSaves Inboximprovements:markingnotificationsasread/unread,andafiltered... CollectivesUpdate:RecognizedMembers,Articles,andGitLab The[script]tagisbeingburninated StagingGroundWorkflow:CannedComments Related 197 HowtogetthetypeofavariableinMATLAB 105 What'sthedifferencebetween&and&&inMATLAB? 390 HowcanIindexaMATLABarrayreturnedbyafunctionwithoutfirstassigningittoalocalvariable? 28 ConfidenceIntervalfort-test(differencebetweenmeans)inPython 0 LearningXORwithdeepneuralnetwork 1 PvaluedifferencebetweenFISHERexacttestandGLM 0 Onesample&TwoSamplet-testsinPython HotNetworkQuestions Isahusband&wifeexecutiveteamaredflag? Hasanylawfailedatestofrationalbasis? Isthereawaytousethesolutionofapolynomialtoapproximatethesolutiontoasimilarpolynomial? WhyisaCalculusIIIstudentmorelikelytosolvethisproblem? Foodchainbasedingeothermalheat? ContractionsinEnglish ReducethesizeofthefilewhileIwriteanarraytoGeoTIFFusingPython Doeshavingresistancetobludgeoning,piercingandslashinggiveresistancetophysical? HowlongmustthehorizontalrunbetomakeanS-trapaP-trap? Searchingforamissingnumberinasequenceofnumbers GeneralizedCLTforanyoperation Makeeusing1,2,3,4,5,6,7,8,9 Howdoesthisswitchdebouncecircuitwork? Howmuchlightwouldbereceivedonarogueplanetclosetothegalacticcenter? ConservationofmassinNavier-Stokesequation 2ddatasetascontour ShouldwetakeintoaccountscopechangestotheSprinttomeasuretheteamefficiency? Doparliamentarysystemsnecessarilyhaveepisodeswhenreplacementleaderscanassumeandkeeppowerwithverylimitedpopularmandatesandappeal? MIxingambientwithflashandhowtocalculatethis? IfmyICisblownthedecouplingcapacitorisshortwhenItestwithamultimeter Cleanupdirectoriesandfileswhenaunittestfails Wouldcopper-basedbloodbemoreeffectiveatcarryingoxygenratherthaniron-based?Orwouldithinderthedeliveryofoxygen? NuclearPistonEngine-Isitpossible? Howcanearbuds+micuseasingleaudiojack? morehotquestions Questionfeed SubscribetoRSS Questionfeed TosubscribetothisRSSfeed,copyandpastethisURLintoyourRSSreader. lang-matlab Yourprivacy Byclicking“Acceptallcookies”,youagreeStackExchangecanstorecookiesonyourdeviceanddiscloseinformationinaccordancewithourCookiePolicy. Acceptallcookies Customizesettings
延伸文章資訊
- 1How to test the significant difference between measured value ...
You could either shift your data to have zero mean (ie subtract the expected mean from your data ...
- 2用MATLAB做T检验(ttest) - CSDN博客
t-检验:t-检验,又称student's t-test,可以用于比较两组数据是否来自同一分布(可以用于比较两组数据的区分度),假设了数据的正态性, ...
- 3用MATLAB做T檢驗(ttest) - 台部落
但是這裏至於paired和unpaired之間的區別我卻還沒搞清楚,只是在Student's t-test中看到了如下這樣一段解釋:. “Two-sample t-tests for a dif...
- 4One-sample and paired-sample t-test - MATLAB ttest
This MATLAB function returns a test decision for the null hypothesis that the data in x comes fro...
- 5Lab 03 : Statistical significance tests with MATLAB
Include the MATLAB code snippets in the report or upload them separately. ... Hints Use of paired...