Mediamark Research Inc. (MRI) said it will increase the annual sample size of respondents to it national syndicated study by 50% to 30,000 from 20,000. The company said it expects the changes, which will begin to be phased in with the March '97 wave of data collection, to reduce sampling error by an average of 18%. Full implementation will require four years of incremental replicates. Costs to MRI clients will rise 25% as a result. Alain Tessier, MRI chairman and CEO, made the announcement at the Advertising Research Foundation's Magazine Audience Research workshop.
Copyright January 1997, Crain Communications Inc.