The most commonly used figures for estimating audience sizes for television programs are those provided by the large survey companies, Nielsen and Arbitron. (religion-online.org)
And I was reminded that Nielson, when it comes to television rating, estimates audience share from a rather small statistical sample. (adistantsoil.com)
Facebook's Ad Metrics Come Under Scrutiny Yet Again There's been some recent controversy over Facebook's estimated audience size that it gives to advertisers. (toprankblog.com)