Nielsen Recalls First Two Rounds of December PPMs; Postpones Delivery Due to Data Problems. The December PPM ratings – the first two rounds of which were already released – are being postponed by Nielsen Audio and will be reissued when data processing problems with week four of the survey are fixed. Obviously, the data in those first two rounds of 24 markets is not valid and is being recalled. TALKERS magazine posted managing editor Mike Kinosian’s “Twelve Takeaways” analysis of those two rounds earlier in the week and has consequently pulled those reports. Kinosian’s “Takeaways” will be reposted when Nielsen issues the new data. Nielsen has not said when it expects to re-issue the December 2018 survey data.