For the second time in less than a month, Nielsen has had to admit its ratings measurement has been inaccurate.
Mediaweek is reporting that Nielsen will have to recalculate and reprocess WCVB and WMUR’s ratings in Boston from January 1 to the 9th, due to a malfunctioning station encoder and faulty monitoring system. The technical glitch gave WCVB lower ratings and WMUR higher ratings, which in turn cost WCVB big time with advertisers.
Nielsen will now reprocess ratings data for all of its clients in the Boston DMA.
Stations in other markets are also reporting problems and question the accuracy of the Nielsen ratings.