See also: Over The Air

CIMM DEFINITION: Television sets in the home that do not have a digital box or households in general that do not subscribe to digital television. Since these homes tend to have no box or boxes without a return path, they are not measured by Set-Top Box data.

NOTE – According to Rentrak, in their Live system, they can assume that the distribution of viewing on non-digital networks is the same for digital and non-digital TVs. Then they compare the share of the non-digital channels from the STB data and apply that share to the full viewing hours of non-STB TVs. The adjustment is only applied to broadcast stations (the channels that are available to over-the-air households) to account for the unmeasured viewing from those households.