The best replacement for nielsen is iri.

The best alternatives to nielsen are rated as following:
★★★★★  iri
★★★★  arbitron
★★  comscore
★★  tns
★★  abs cbn
★  veritas planes
★  veritas
★  uggams
★  gore
★  veritas saws
★  rentrak
  nielsen
  veritas block plane
  steve martin
  joan rivers
  clifton
  jeter
  kantar
  dan logue

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