J. Med. Internet Res. - Comparison of US panel vendors for online surveys.


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CKGROUND: Despite the increasing use of panel surveys, little is known about the differences in data quality across panels.OBJECTIVE: The aim of this study was to characterize panel survey companies and their respondents based on (1) the timeliness of response by panelists, (2) the reliability of the demographic information they self-report, and (3) the generalizability of the characteristics of panelists to the US general population. A secondary objective was to highlight several issues to consider when selecting a panel vendor.METHODS: We recruited a sample of US adults from 7 panel vendors using identical quotas and online surveys. All vendors met prespecified inclusion criteria. Panels were compared on the basis of how long the respondents took to complete the survey from time of initial invitation. To validate respondent identity, this study examined the proportion of consented respondents who failed to meet the technical criteria, failed to complete the screener questions, and provided discordant responses. Finally, characteristics of the respondents were compared to US census data and to the characteristics of other panels.RESULTS: Across the 7 panel vendors, 2% to 9% of panelists responded within 2 days of invitation; however, approximately 20% of the respondents failed the screener, largely because of the discordance between self-reported birth date and the birth date in panel entry data. Although geographic characteristics largely agreed with US Census estimates, each sample underrepresented adults who did not graduate from high school and/or had annual incomes less than US $15,000. Except for 1 vendor, panel vendor samples overlapped one another by approximately 20% (ie, 1 in 5 respondents participated through 2 or more panel vendors).CONCLUSIONS: The results of this head-to-head comparison provide potential benchmarks in panel quality. The issues to consider when selecting panel vendors include responsiveness, failure to maintain sociodemographic diversity and validated data, and potential overlap between panels.

Resumo Limpo

ckground despit increas use panel survey littl known differ data qualiti across panelsobject aim studi character panel survey compani respond base timeli respons panelist reliabl demograph inform selfreport generaliz characterist panelist us general popul secondari object highlight sever issu consid select panel vendormethod recruit sampl us adult panel vendor use ident quota onlin survey vendor met prespecifi inclus criteria panel compar basi long respond took complet survey time initi invit valid respond ident studi examin proport consent respond fail meet technic criteria fail complet screener question provid discord respons final characterist respond compar us census data characterist panelsresult across panel vendor panelist respond within day invit howev approxim respond fail screener larg discord selfreport birth date birth date panel entri data although geograph characterist larg agre us census estim sampl underrepres adult graduat high school andor annual incom less us except vendor panel vendor sampl overlap one anoth approxim ie respond particip panel vendorsconclus result headtohead comparison provid potenti benchmark panel qualiti issu consid select panel vendor includ respons failur maintain sociodemograph divers valid data potenti overlap panel

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