MediaPost writes that DoubleClick is scheduled to issue today a report that examines three methods of determining whether online ad campaigns reach their target demographics: data from comScore's panel; cookies placed on user's machines by Nielsen/NetRatings; and modeling. The intent of the research, according to DoubleClick director of research Rick Bruner, is merely to inform media buyers that the tools for measuring demographic reach exist. The report does not conclude which method is most effective or how closely those reached by the ads matched the targeted demographics.