Comparison of US Panel Vendors for Online Surveys

Despite the increasing use of panel surveys, little is known about the differences in data quality across panels.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...