Monday, Nielsen delayed the release of its May radio ratings, saying it needed more time to perform "quality control reviews" because of concerns that its audience estimates might have been compromised.
The ratings are now expected to be released June 17. Nielsen also has announced April's PPMs report would be re-issued June 19.
Nielsen said it would revise the ratings issued for April because those numbers also appeared to be tainted.
"After reviewing preliminary data for the Nielsen Audio Los Angeles PPM market, we discovered inconsistencies with the household ratings that lead us to conduct a more in-depth analysis of the data," Nielsen said in a statement distributed to radio stations on Wednesday.
Nielsen has been attempting to verify that individuals who participated in its sample audience panel were truly independent and did not have ties to any radio stations or radio personalities that were being measured.
The ratings agency said Wednesday that it needed to "remove a household from the panel for not meeting our quality standards."
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