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FinanceandEconomicsDiscussionSeries
FederalReserveBoard,Washington,D.C.
ISSN1936-2854(Print)
ISSN2767-3898(Online)
DoesitPaytoSendMultiplePre-PaidIncentives?EvidencefromaRandomizedExperiment
AndrewC.Chang,JoanneW.Hsu,EvaMa,KateBachtell,andMicahSjoblom
2024-023
Pleasecitethispaperas:
Chang,AndrewC.,JoanneW.Hsu,EvaMa,KateBachtell,andMicahSjoblom(2024).“DoesitPaytoSendMultiplePre-PaidIncentives?EvidencefromaRandomizedExperi-ment,”FinanceandEconomicsDiscussionSeries2024-023.Washington:BoardofGovernorsoftheFederalReserveSystem,
/10.17016/FEDS.2024.023
.
NOTE:StafworkingpapersintheFinanceandEconomicsDiscussionSeries(FEDS)arepreliminarymaterialscirculatedtostimulatediscussionandcriticalcomment.TheanalysisandconclusionssetfortharethoseoftheauthorsanddonotindicateconcurrencebyothermembersoftheresearchstafortheBoardofGovernors.ReferencesinpublicationstotheFinanceandEconomicsDiscussionSeries(otherthanacknowledgement)shouldbeclearedwiththeauthor(s)toprotectthetentativecharacterofthesepapers.
Page1of22
DoesitPaytoSendMultiplePre-PaidIncentives?
EvidencefromaRandomizedExperiment
April15,2024
AndrewC.Chang,*BoardofGovernorsoftheFederalReserveSystem,
andrew.c.chang@
JoanneW.Hsu,†UniversityofMichigan,
jwhsu@
EvaMa,BoardofGovernorsoftheFederalReserveSystem,
eva.ma@
KateBachtell,NORCattheUniversityofChicago,
bachtell-kate@
MicahSjoblom,NORCattheUniversityofChicago,
sjoblom-micah@
Abstract
Toencouragesurveyparticipationandimprovesamplerepresentativeness,theSurveyof
ConsumerFinances(SCF)offersanunconditionalpre-paidmonetaryincentiveandseparatepost-paidincentiveuponsurveycompletion.Weconductedapre-registeredbetween-subject
randomizedcontrolexperimentwithinthe2022SCF,withatleast1,200householdsper
experimentalgroup,toexaminewhetherchangingthepre-paidincentivestructureaffectssurveyoutcomes.Weassesstheeffectsof:(1)alteringthetotaldollarvalueofthepre-paidincentive
(“incentiveeffect”),(2)givingtwoidenticalpre-paidincentivesholdingthetotaldollarvalue
fixed(“remindereffect”),and(3)offeringmultiplepre-paidincentivesofdifferentamounts
holdingthetotaldollarvaluefixed(“slopeeffect”)onsurveyresponserates,interviewerburden,anddataquality.Ourevidenceindicatesthatasingle$15pre-paidincentiveincreasesresponseratesandmaintainssimilarlevelsofinterviewerburdenanddataquality,relativetoasingle$5pre-paidincentive.Splittingthe$15intotwopre-paidincentivesofdifferentamountsincreasesinterviewerburdenthoughlengtheningtimeinthefieldwithoutimprovingresponserates,
reducingthenumberofcontactattemptsneededforaresponse,orimprovingdataquality,regardlessofwhetherthefirstpre-paidislargerorsmallerthanthesecond.
Keywords:pre-paidincentives;unconditionalincentives;sequentialincentives;responserates;surveys;dataquality;householdfinance
JELCodes:C83;C93;G5
*:ORCID0000-0002-9769-789X.†:ORCID0000-0002-0715-6230.Theanalysisandconclusionssetforthare
thoseoftheauthorsanddonotindicateconcurrencebyothermembersoftheBoardofGovernorsoftheFederal
ReserveSystem,itsresearchstaff,ortheNORCattheUniversityofChicago.WethankCathyHaggerty,
MichaelKalmar,KatherineMcGonagle,KevinB.Moore,HeatherSawyer,AliceHenriquesVolz,andconference
participantsatthe2023JointStatisticalMeetingsforcommentsandhelpwiththisproject.Ourpre-registrationplan
isontheOpenScienceFrameworkunder“2022SCFPre-paidIncentivesExperiment”at
/10.17605/OSF.IO/BXJNE.
ThisexperimentwasapprovedbytheInternalReviewBoardoftheNORCattheUniversityofChicagounderprotocolID#21-08-433.
Page2of22
Introduction
Anincreasinglychallengingenvironmentforrecruitingparticipantsforsurveysposesmanyrisks
forresearcherswhoneedtobalanceachievingrepresentativesamplesandmaintainingdata
qualitywithcontrollingfinancialcostsandtimeinthefield.Incentives,includingpre-paid
incentives,whichareunconditionalonsurveycompletion,areoneimportanttooltoencouragesurveyresponse.Whilesurveystypicallyemployasinglepre-paidincentive,duringdata
collectionpre-paidincentivescanbestructuredinavarietyofways.
TheSurveyofConsumerFinances(SCF),
1
sponsoredbytheFederalReserveBoard(FRB),
beganemployingpre-notificationpostcardsfollowedbyapre-paidincentiveoffivedollarscashwithinvitationlettersforthe2016wave,basedonfindingsfromHsu,Schmeiser,Haggerty,andNelson(2017).Toexplorehowchangesinthestructureofrespondentincentivescouldimproveresponserates,durationinthefield,anddataqualityweembeddedan8weekfieldexperimentwithinthe2022SCF.Werandomlyassignedrespondentsacross6groupswithvaryingpre-paidincentivestructuresandamounts,includingonegroupwiththepreviouslyusedsinglepre-paidincentiveof$5.Inourexperiment,wetestedthreedifferentconditions:(1)alteringthetotal
dollarvalueofthepre-paidincentive(“incentiveeffect”),(2)givingtwoidenticalpre-paid
incentivesholdingthetotaldollarvaluefixed(“remindereffect”),and(3)offeringmultiplepre-paidincentivesofdifferentamountsholdingthetotaldollarvaluefixed(“slopeeffect”).
Weanalyzetheexperimentalresultstodeterminetheeffectsofdifferentpre-paidincentive
structuresonsurveyresponserates,interviewerburden,anddataqualityusingamixed-mode
(phoneandface-to-face)surveyonhouseholdfinances.Theresultsprovideinsightsintothe
costsandbenefitsofdifferentdesignsandvaluesofpre-paidincentivesforcompletinganin-
depthinterviewer-administeredsurveyonasensitivetopic.Moreover,byofferingincentive
amountsinavarietyofvalues,weinvestigatewhethertherelationshipbetweenhigherincentiveamountsandcompletionratesismonotonicordeterioratesatlargervalues.
Wefindthatlargerpre-paidincentivesyieldedhigherresponseratesofabout2or3percentagepoints(aroundathirdofthebaselineresponserate)withnodeleteriouseffectonothersurveyoutcomes,andthatitisbettertosendtheincentiveasasinglepayment,ratherthansplittingitintomultiplepayments.Splittingtheincentiveintopaymentsofdifferentamountsincreased
fieldinterviewerburdenthroughincreasingtimeinthefieldwithoutimprovingresponserates,reducingthenumberofcontactattemptsneededforaresponse,orimprovingdataquality.
TheoreticalBackgroundontheResponsetoPre-paidMonetaryIncentives
Anextensivebodyofempiricalandtheoreticalresearchsupportstheuseofincentivesaspartofabroaderstrategytopromotesurveycompletion.Anabundanceofresearchhasshownthat
unconditionalpre-paidincentivesareparticularlyeffectiverelativetoconditionalpost-paid
1BoardofGovernorsoftheFederalReserveSystem(2023b).TheSCFcollectsinformationonUShousehold
income,wealth,debts,andotherfinancialoutcomes.SeeAladangady,Bricker,Chang,Goodman,Krimmel,Moore,Reber,HenriquesVolz,andWindle(2023)foradescriptionoftheSCF.
Page3of22
incentives(BlohmandKoch2021).Inaccordancewiththeoriesofsocialexchange,
noncontingentpre-paidincentivescanencouragesurveyresponsebyprovidingapsychologicalsenseofobligationtoreturnthefavoroftheincentive(Gouldner1960;Dillman1978).
Leverage-saliencytheoryprovidesanothermechanism:apre-paidincentivecouldhelpestablishtrustthatarespondentwillhonortherequestandcompletethesurvey(Groves,Singer,and
Corning2000).Thatsaid,incentivescouldappealtoexternalmotivations,whicharetypicallylesseffectivethanintrinsicoraltruisticmotivationsatgeneratingcompliancewithasurvey
request(Hansen1980).
Theeffectivenessofincentivesvariesbydesignandsize.Differentincentiveamountsmay
generateavaryingleverageorstrongerfeelingsofobligation.Accordingtotheoriesofeconomicexchange,respondentsrespondtosurveyswhentheoverallbenefitsoutweighthecosts,andthuslargerincentivesshouldyieldhigherresponserates(BinerandKidd1994).However,response
ratesmaynotincreasemonotonicallywiththesizeoftheincentive.Somestudieshavefoundthattherelationshipbetweenthesizeofpre-paidincentivesandresponseratesisnonlinear(Warriner,Goyder,Gjertsen,Hohner,andMcSpurren1996;TrussellandLavrakas2004).
2
Onepossible
explanationisthatthesizeoftheincentivemayappealdifferentiallytofactorsofloworhigh
leverage,feelingsofreciprocity,orperceptionsofsurveylegitimacy.Inaddition,excessively
largeincentivescouldleadrespondentstodistrustthesurveyorappealtooheavilytoextrinsic
motivatorstobeeffective.Thatsaid,ananalysisofanincreaseintheSCF’spost-paidincentivefrom2007to2010foundthattheincreasereducedthecontactattemptsandtimeinthefield
neededforaresponsewhilemaintainingdataquality(Bricker2014).Anda2014experimentthatimitatedtheinstrumentandfieldstrategyoftheSCFfoundnonegativeeffectsforverylarge
conditionalpost-paidincentives(Hsu,Schmeiser,Haggerty,andNelson2017).
Mostsurveysemploypre-paidincentivesonceduringdatacollection.
3
Butgiventhe
proliferationofjunkmail,individualsmaypaylessattentiontotheirpostalmailormaymissaninitialmailerorincentiveentirely.Consequently,somestudieshaveinvestigatedtheuseof
repeated(sequential)pre-paidincentiveswiththehopethatarepeatincentivewillelicitmore
careful(orany)readingandconsiderationofthesurveymaterialsbytherespondent.MesserandDillman(2011)foundthatfollowingupaninitialrequestthatincludeda$5pre-paidincentive
withasecond$5pre-paidincentiveviaprioritymailtononrespondersincreasedtheresponse
rateofastate-widewebsurveyfrom59%to68%.Inthecontextofadifferentmail-websurvey,Wagner,West,Couper,Zhang,Gatward,Nishimura,andSaw(2023)foundthatfollowingupa$2pre-paidincentiveincludedintheinitialmailingwithanadditional$5sentviaprioritymailconsiderablyincreasedresponserates.However,inbothofthesestudiestheeffectofthesecondincentivecannotbedisentangledfromtheeffectoftheprioritymailing.
2Relatedly,Han,Montaquila,andBrick(2013,Table2)findthatthesizeofapre-paidincentiveaffectsresponseratesconditionalonhowquicklyeligiblerespondentscompleteascreener.
3Correspondingly,therearealargenumberofstudiesthatevaluatewhetherasinglepre-paidincentiveaffectsresponserates.Forexample:Hsu,Schmeiser,Haggerty,andNelson(2017);Frederiks,Romanach,Berry,andToscas(2020);Jackson,McPhee,andLavrakas(2020);Powell,Geronimo-Hara,Tobin,Donoho,Sheppard,
Walstrom,Rull,andFaix(2023).
Page4of22
Dykema,Stevenson,Assad,Kniss,andTaylor(2021)conductedanexperimentinamailsurvey
ofphysiciansandfoundthat“secondincentives[sentamonthafterthefirstincentives]were
associatedwithhigherresponseratesandlowercostspercompletedsurvey”butnomeasurableeffectonitemnonresponse.Dillman,Smyth,andChristian(2014,p.424)nowrecommend
researchersinmixed-modestudiestoincludeasecondcashincentivewiththeirfollow-up
communicationstoprovideopportunitiesfor“latercommunications[to]beread,andhopefullyactedupon,therebyincreasingoverallresponse.”Thatsaid,Dykema,Jaques,Cyffka,Assad,
Hammers,Elver,Malecki,andStevenson(2015)foundthatasecondpre-paidincentive,againtargetingnonresponders,didnotincreaseresponserates.
Fewstudieshaveinvestigatedthedifferentialeffectofrepeatedincentivesthatareincreasingordecreasinginsize,whatwecallthe“slopeeffect”.OneexampleisDykema,Stevenson,Assad,Kniss,andTaylor(2021),whofoundfewmeasurabledifferencesinresponseratesoritem
responseforsecondincentivesthatarelargerthanthefirstincentive,relativetosecond
incentivesthataresmallerthanthefirst.Similarly,theyfoundtherepresentativityofrespondersforeitheroftheseconditionswasnotsignificantlydifferentfrombenchmarkadministrativedata,sotheslopeeffectintheirstudyappearstohavemadenodifferencesinsurveyoutcomes.
Inourstudy,weanalyzepre-paidincentivesinthecontextofanationallyrepresentativemixed
mode(face-to-faceandphone)surveyinwhichrespondentsareinitiallycontactedviamail.
Whilemostexistingstudiesinvolvedsendingsecondincentivesonlytononresponders,ourstudydeliveredsecondmailingsandincentivestopotentialrespondentstwoweeksafterthefirst,
regardlessofresponse.
Methods
OverviewoftheSurveyofConsumerFinances
TheSCFisanationallyrepresentativesurveyonthefinancesofUShouseholds,conductedonadifferentcross-sectionofUSfamiliestriennially(BoardofGovernorsoftheFederalReserve
System,2023b).Topicscoveredincludeincome,assets,debts,otherfinancialcharacteristics,andeconomicbehavior.Thesurveyisadministeredbyfieldinterviewers(FIs)and,historically,isprimarilyconductedface-to-face.
GiventhehighconcentrationofwealthintheUnitedStates,theSCFusesadual-framesampletoensurecoverageacrossthefulldistributionofwealth.TheSCFemploysbothanaddress-based
multistagenationallyrepresentativearea-probability(AP)samplecomplementedbyastratifiedlistsamplespecificallydesignedtooversamplewealthyAmericans.
4
Inthefaceofan
increasinglychallengingenvironmentforsurveyresponseratesoverthepasttwodecades,theSCFhasrepeatedlyextendedtimeandaddedexpensesinthefield.Eachwavesince2004
requiredanaverageextensionof2.5additionalmonthsbeyondthetargetfieldperiodofeightmonths,withthe2019and2022wavesneedingextensionsofabout4months.
5
4SeeKennickell(2005)foradiscussionofthesamplingprocedure.
5In2022theAPsampleresponseratewasabout42percent,andthelistsampleresponseratewasabout27percent,usingRR1fromAAPOR(2015).SeetheappendixestoBhutta,Bricker,Chang,Dettling,Goodman,Hsu,Moore,Reber,HenriquesVolz,andWindle(2020);Aladangady,Bricker,Chang,Goodman,Krimmel,Moore,Reber,
Page5of22
StudyDesign
The2022SCF,whichwassponsoredbytheFRBwithcooperationfromtheStatisticsofIncomeDivision(SOI)attheInternalRevenueService,andconductedbytheNationalOpinionResearch
Center(NORC)attheUniversityofChicago,includedapre-registeredbetween-subject
randomizedcontrolexperimentwithintheAPsamplewithsixdifferentpre-paidincentive
groups(a1x6celldesign).
6
Werefertoparticulargroupsusingtheformat$[First]/$[SecondPre-PaidAmount].Onegroup($5/$0),structuredtobeidenticaltothepre-paidincentivefromthe
2016and2019SCFs,receivedasingle$5pre-paidincentive,followedbyasecondmailerwithnomonetaryincentive.Theotherfivetreatmentgroups,showninTable1,facilitatedtestingtheeffectsof:(1)largertotalincentivepayments(theincentiveeffect),(2)twoincentivepaymentsperrespondentagainstasinglepre-paidincentivewiththesametotalvalue(theremindereffect),and(3)secondpre-paidincentivesthatarelargerorsmallerinsizethanthefirstincentive,
controllingfortotalvalue(theslopeeffects).
Table1:TreatmentGroupDefinitions
Group
First
Pre-paidincentiveamount
SecondPre-paidincentiveamount
Sample
Size
Notes
$5/$0
$5
-
2,152
The2016/2019SCFincentive,controlfortotal$amountforsinglepre-paidincentives
$5/$5
$5
$5
1,292
Baselinemultiplemailertreatment
$10/$0
$10
-
1,291
Total$amountcontrolforbaselinemultiplemailers($5/$5group)
$5/$10
$5
$10
1,293
Testsupwardslopeofincentive
$10/$5
$10
$5
1,291
Testdownwardslopeofincentive
$15/$0
$15
-
1,297
Total$amountcontrolforslopeconditions($5/$10and$10/$5groups)
WestratifiedourrandomizationbyNationalFrameArea(NFA,aprimarysamplingunitofgeographyusedbyNORCtocreatetheAPframe)acrossallNFAsintheAPsample.
RandomizationwasconductedbyNORCwithaquasi-randomnumbergeneratorwithno
rerandomization.Duetolimitsondrawingthesamplingframeforthe2022SCFandthe
simultaneousnatureofthetreatmentacrossallsampleunits,householdswerenotreallocatedacrosstreatmentgroupstobalancetreatmentgroupsizeswhenahouseholdwasoutofscope.
WecalibratedexperimentalgroupsamplesizesbasedonthetreatmenteffectsizesfromHsu,Schmeiser,Haggerty,andNelson(2017),whichistheclosestpapertooursintermsof
institutionalsetting.Weselectedsamplesizestogive80%powerforourexpectedtreatment
HenriquesVolz,andWindle(2023)forinformationontheresponseratesandfieldperiodduration.IntheSCF,householdsmustanswerallcriticalquestionswithinthesurveyinstrumentforaninterviewtobecomplete.The2022SCFcodebookdenoteswhichquestionsarecritical(BoardofGovernorsoftheFederalReserveSystem
2023a).ThereisnoSCFstandardforpartialcompletes.
6Ourpre-registrationplanisontheOpenScienceFrameworkunder“2022SCFPre-paidIncentivesExperiment”at
/10.17605/OSF.IO/BXJNE
(Chang2023).Thepre-registrationplanalsoincludesaplanfor
analysisoftheexperimentaldata.
Page6of22
effectonresponserates.
7
Theresultingsamplesizes,showninTable1,areatleast1,200
householdspertreatmentgroupandareovereighttimeslargerthanthosefeaturedinHsu,
Schmeiser,Haggerty,andNelson’swork.Similarly,thetreatmentgroup-levelsamplesizesaretwotofourtimeslargerthanMesserandDillman(2011)andDykemaetal.(2015,2021),whoalsolookattheeffectsofsecondpre-paidincentivesonresponserates.Ourlargersamplesizesgiveusmuchmorestatisticalpowertodetecttreatmenteffects.
FieldingofourexperimentbeganbymailingallhouseholdsintheAPsampleapostcard
introducingtheSCFbetweenlateMarchandearlyApril2022.Thefirstenvelopemailing,sentonApril6th,2022withtheUSPS,includedaninvitationletteraskingtheheadofhouseholdto
providetheircontactinformationthroughasecurewebsiteandwasaccompaniedbythefirstpre-paidcashincentive—$5,$10,or$15,dependingonthegroup.
8
Asecondenvelope,mailedtwoweekslaterwiththeUSPS,includedapre-contactletterindicatingthatafieldinterviewerwouldbereachingouttodescribethestudyfurtherandscheduleaninterview.Thesecondenvelope
wasaccompaniedbyasecondpre-paidcashincentiveequalto$5or$10forthreeofthesix
experimentalgroups.Householdsintheremainingthreegroupsdidnotreceivecashwiththesecondenvelope.Allhouseholdsreceivedasecondenvelope,sotheamountofthesecondpre-
paidcashincentivewasnotdependentonsurveycompletion.Theinvitationletterandall
additionalmaterialsleftbytheinterviewerincludedatoll-freenumberthatarespondentcouldcallwithquestionsatanytimeduringtheexperimentortocompleteaninterview.
Envelopesincludedtransparentwindows,sohouseholdscouldseefromanexaminationoftheexteriorthattherewascashinside.SeeFigure1foramock-upofthemailingenvelope.
Envelopeswith$5hadasingle$5billinthewindow.Envelopeswith$10or$15hada$10billplacedinthewindow,andthosethatreceived$15alsohada$5billinsidetheenvelope,placeddirectlybehindthe$10bill,sothe$5billwasnotvisiblefromtheexterior.Therefore,thetotalamountofthepre-paidcashincentivewasonlydiscernablefromopeningtheenvelope.Other
visualelementswereminimizedtodistinguishtheenvelopefromcommercialsalesmaterialsandavoiddetractingfromthecashenclosure.
7Seeourpre-registrationplanforadditionaldetailsonthepowercalculations(Chang2023).
8Householdswhoprovidedtheircontactinformationthroughthesecurewebsitewerepaidanadditional$10,anamountthatwasnotdependentonthehousehold’sexperimentalgroup.
Page7of22
Figure1:MailingEnvelopeMock-Up
Front:
Back:
Intervieweroutreachtosampledhouseholdsbeganinmid-April2022.Initialcontactattemptsfocusedonhouseholdsthathadprovidedcontactinformationthroughthesecurewebsite.Toavoidexperimentereffects,fieldstaffwerenotawareofahousehold’spre-paidincentive
amount(s),thoughthisinformationcouldbevoluntarilygiventofieldstaffbythehousehold
afterinitialcontact.ThefieldperiodforourexperimentendedonJune1st,2022,8weeksafterwemailedthefirstenvelope.Completedinterviewsfollowedthesamepost-paidincentive
structureregardlessofpre-paidtreatmentassignment.
Page8of22
Model
Weusedpairwisecomparisonswithregressions/linearprobabilitymodelsoftheform:
yi,s=Σ∀sas,y+βytTeatmenti,s+Ei,s,y(1)
Weestimatedthemodelswithordinaryleastsquareswiththeomittedcategoryasthecontrol
group.Theoutcomeyforindividualiinstratum(NFA)sisafunctionofafullvectorofstratumdummies(as,y),followingtherecommendationofBruhnandMcKenzie(2009),andatreatmentgroupindicator.Thetreatmentindicatordependedonthehypothesisbeingtested.WeweightedanalysesbytheNFA’sinverseprobabilityofselectionintothe2022SCF.StandarderrorswerecalculatedusingHuber-Whiteheteroskedasticityconsistentstandarderrors(White,1980).
ResearchQuestionsandAnalysisMethods
Ourexperimentaldesignfacilitatedtestingthefollowinghypotheses:
Hypothesis1:Largervaluesoftotalcashpre-paidincentivesaffectsurveyoutcomes(theincentiveeffect).
.Hypothesis1a:$5vs.$10.Include$10/$0and$5/$0groupsinequation(1),testβy(treatmentgroupis$10/$0).
.Hypothesis1b:$10vs.$15.Includegroups$15/$0and$10/$0inequation(1),testβy(treatmentgroupis$15/$0).
.Hypothesis1c:$5vs.$15.Includegroups$15/$0and$5/$0inequation(1),testβy(treatmentgroupis$15/$0).
Hypothesis2:Asecondpre-paidincentive(througharemindereffect),controllingforthetotal
pre-paidincentivecashamountacrossenvelopes(theincentiveeffect),affectssurvey
outcomesundernochangeintheincentiveamountbetweenincentives(noslopeeffect).
.Include$5/$5and$10/$0groupsinequation(1),testβy(treatmentgroupis$5/$5).
Hypothesis3:Theincreasingordecreasingtheamountofpre-paidincentivecashbetweenmultipleenvelopes(theslopeeffect),controllingforthetotalcashamount(theincentive
effect)affectssurveyoutcomes.
.Hypothesis3a:Increasingslopeofincentive.Include$5/$10and$15/$0groupsinequation(1),testβy(treatmentgroupis$5/$10).
.Hypothesis3b:Decreasingslopeofincentive.Includegroups$10/$5and$15/$0inequation(1),testβy(treatmentgroupis$10/$5).
Wetestedsurveyoutcomesrelatedtoresponserates,interviewerburden,anddataquality.Forresponserates,weemployedAAPOR(2015)’sRR1withtheSCFstandardforcompleted
interviews,andalsolookedattheshareofinviteeswhoscheduledinterviewappointments.Forinterviewerburden,weanalyzed:thenumberofcontactattemptsneededtocompletean
interview;thenumberofcontactattemptsneededtoelicitawebsitevisitorascheduled
Page9of22
appointment;
9
andthedurationoftimebetweenwhenthefirstpre-paidwasmailedanda
completedinterview.Finally,fordataquality,welookedattwooutcomes.Thefirstisitem
responserates:theshareofquestionsthattherespondentcompletedfromtheinstrumentofthosethattherespondentwaseligiblefor.Theseconddataqualityoutcomeistheitemresponserateforquestionsthatrequiredadollarvalueasaresponsethatwereansweredwithanexactdollar
value,amongthoseinterviewscompletedwithatleast50%ofeligibledollarvaluequestionsbeingnon-missing.
10
Table2displayssamplesizesandaverageoutcomesforeachgroup.
11
9Wehadinitiallyspecifiedaddingcontactattemptsbeforeacallbacktothismeasure,butforoperationalreasonswewereunabletoeffectivelytrackcallbacks.
10Affectingthesurveyresponseratethroughourpre-paidincentivetreatmentmayalsohaveaffectedthe
participationofrespondentswhoaredifferentiallylikelytocompletethesurveywithmissinganswers.SeetheAppendixfordetailsonhowweusedSCFparadatatoconstructthesemeasures.SeeMeyer,Mok,andSullivan(2015)forareviewofsurveydataquality.
11OurresponseratesarenotcomparabletotheoverallSCFresponseratesbecauseallexperimentaloutcomesweremeasuredwithin8weeksofthestartoftheexperiment,incontrasttoanapproximatelyyear-longfieldperiodfortheentireSCF.
Page10of22
Table2:SampleSizes,ResponseRates,InterviewerBurden,andDataQualityby
ExperimentalGroup
ExperimentalGroup:
AmountofFirst/SecondPre-paidIncentive
$5/$0$5/$5$10/$0$5/$10$10/$5$15/$0
Total
N
2,1521,2921,2911,2931,2911,297
8,616
Worked
1,411865849844873870
5,712
%Worked
65.667.065.865.367.667.1
66.3
ResponseRates
Appointments(count)
270186200193201193
1,243
%Appointments
12.514.415.514.915.614.9
14.4
Completes(count)
140102111115110121
699
%Completes
6.57.98.68.98.59.3
8.1
InterviewerBurden
AvgAttemptsBeforeAppt
1.61.81.51.51.61.4
1.6
StandardDeviation
1.61.91.61.51.71.9
1.7
AvgAttemptsBeforeComplete
3.23.73.43.53.63.3
3.4
StandardDeviation
1.82.11.91.72.21.8
1.9
AvgDaysBeforeComplete
29.226.329.431.030.126.5
28.8
StandardDeviation
13.813.214.013.813.413.6
13.7
DataQuality
Avg%QuestionsAnswered
97.997.698.497.897.598.0
97.9
StandardDeviation
2.22.61.92.62.82.0
2.4
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