RT Journal Article SR Electronic T1 “Does Anyone Really Know If Online Ad Campaigns Are Working?” JF Journal of Advertising Research JO J Advert Res FD WARC SP 354 OP 373 DO 10.2501/S002184991009152X VO 50 IS 4 A1 Paul J. Lavrakas A1 Sherrill Mane A1 Joe Laszlo YR 2010 UL http://www.journalofadvertisingresearch.com/content/50/4/354.abstract AB In 2008, the Interactive Advertising Bureau (IAB) commissioned a study of the reliability and validity of the predominant methods used to assess Internet advertising effectiveness (IAE). The evaluation was conducted by an expert research methodologist who had no prior association with the IAB or any of the IAE measurement companies (IAB 2010). The study concluded that the methods that were evaluated have uncertain reliability and validity due to (1) an almost exclusive use of quasi-experimental designs with non-equivalent comparison groups, (2) extremely low response rates that likely lead to non-ignorable nonresponse bias, and (3) weighting methods that have not been shown to actually “fix” the problems they strive to address.