Nielsen has informed clients that it removed four homes from its Los Angeles PPM panel, effective with the April survey ratings released today. “An internal review determined that these homes did not meet our compliance and data integrity standards,” the company told clients in a product notification. Nielsen says it is conducting a review of the homes and because the review is ongoing, it can’t share more details at this time.
While the company caught the suspect households and removed them before today’s release of the April ratings, an impact analysis of back data determined seven survey months of ratings included the tainted households, spanning October 2017-March 2018. The company will begin reissuing ratings from those months starting with the March 2018 survey on May 22.
While the company has reissued ratings in the past, it is rare to reissue seven months of ratings.
“The integrity of our data is a top priority,” a Nielsen spokesperson said in a statement emailed to InsideRadio.
The company issued the following schedule of dates for the reissued ratings:
- March 2018 Monthly Data are expected Tuesday May 22
- February 2018 Monthly Data in the week of May 28
- January 2018 Monthly Data in the week of June 4
- Holiday 2017 Monthly Data in the week of June 11
- December 2017 Monthly Data in the week of June 18
- November 2017 and October 2017 Monthly Data in the week of June 25.