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Advertising effectiveness tests combining surveys and electronic tracking of online advertising are common, and the method is increasingly being utilized within more comprehensive, cross-media methodologies. The validity of these tests, however, has sometimes been called into question because of the short duration between online advertising exposure and survey taking. Using a unique database containing more than 1,600 online advertising campaigns, we find that there is a measurable but weak relationship between time since last exposure and branding effectiveness, indicating the shortness of duration does not have a substantial impact on the validity of these tests.
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