computing an EWMA of a DataFrame by time - Stack OverflowJoinStackOverflowtolearn,shareknowledge,andbuildyourcareer.SignupwithemailSignupSignupwithGoogleSignupwithGitHubSignupwithFacebookHomePublicQuestionsTagsUsersCollectivesExploreCollectivesFindaJobJobsCompaniesTeamsStackOverflowforTeams–Collaborateandshareknowledgewithaprivategroup.CreateafreeTeamWhatisTeams?TeamsCreatefreeTeamCollectivesonStackOverflowFindcentralized,trustedcontentandcollaboratearoundthetechnologiesyouusemost.LearnmoreTeamsQ&AforworkConnectandshareknowledgewithinasinglelocationthatisstructuredandeasytosearch.LearnmoreSimplePythonPandasEMA(ewma)?AskQuestionAsked3years,4monthsagoActive1year,6monthsagoViewed22ktimes22IwrotesomecodetobuildmyownEMA/MACD,buthavedecidedtogivePandasatryinstead.IamusingthiswebsitebelowasabasicunderstandingofEMAandtryingtogetpandastogivemethesameanswerstobesureIamusingpandascorrectly:http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:moving_averagesAndhereisthechartwiththedatathatImworkingwith.HereisthecodeI'mtryingtogettowork,butitgivesmedifferentoutputthanthe10-dayEMAcolumnimportpandasaspddata=[22.27,22.19,22.08,22.17,22.18,22.13,22.23,22.43,22.24,22.29,22.15,22.39,22.38,22.61,23.36,24.05,23.75,23.83]df=pd.Series(data)pd.ewma(df,span=10)I'vealsotriedthiswithnoluck.pd.ewma(df,span=10,min_periods=10)Anyhelpisappreciated.pythonpandasShareImprovethisquestionFollowaskedFeb4'18at21:24hahahaheyhahahahey6911goldbadge22silverbadges66bronzebadges1PossibleduplicateofDoesPandascalculateewmwrong?– PeterLeimbiglerFeb4'18at22:07Addacomment | 2Answers2ActiveOldestVotes6Coincidentally,thisquestionwasaskedandansweredhere:DoesPandascalculateewmwrong?Checkout@chrisb'sanswerthere.TocomputetheEWMasdescribedinthearticleyou'restudying:manuallycomputethefirstvalidsimpleMAtoserveasastartingpointforEWArunpandas'EWMwithadjust=FalseShareImprovethisanswerFollowansweredFeb4'18at22:11PeterLeimbiglerPeterLeimbigler7,64911goldbadge1313silverbadges2424bronzebadgesAddacomment | 2