From A for AGF Videoforschung to Z for zapping, the most important technical terms in video research are explained here.

Watermarking refers to the superimposition of audio or video signals conveying information that cannot be heard or seen by users, which are used to recognize broadcasters and/or content for the purposes of television usage measurement. The watermarking information is read out from the audio-video signals with the aid of special technical processes. Depending on the information provided, watermarking can be used for television usage measurement, but also for purposes of digital rights management.

Web TV refers to the free transmission of television content via the Internet. In this case, TV programmes are transmitted by streaming via DSL.

Web-only refers to information delivered in the c-variables. It serves the purpose of identifying videos that can only be found in the Internet. Such videos can be previews or even exclusive streaming videos.

WEBCROSS is an online application of DAP GmbH that was developed on behalf of AGF Videoforschung. The primary function of WEBCROSS is the visualization of the convergent usage data of AGF that include not only TV data (30-minute steps), but also video streaming data (at the offering unit level). WEBCROSS is available to AGF clients for analysis purposes.

Weighting is a method by which the importance of characteristics in the sample is adapted to the importance of the universe in order to ensure a more exact extrapolation or depiction. Each reporting person of the AGF Panel is assigned a weight to compensate for structural differences between sample and universe. If the structure of a sample is exactly identical to the structure of the universe, each person is assigned the weight of 1. In reality, however, some units are always either over-represented or under-represented. Over-represented units are given a weight of less than 1, under-represented units a weight of more than 1. Depending on the structure of daily reporting households, the weight assigned to the same person or household can change on a daily basis.

In the AGF Panel, weighting is performed every day in two steps:

  1. Provisional weighting of usage data on the day after broadcast
  2. Final weighting of these usage data after factoring in additional retrieval possibilities in the three subsequent days

Weighting characteristics are the characteristics applied for the weighting of persons or households in the AGF Panel. The German state, municipality size, reception level classification and a number of socio-demographic characteristics of households and persons are included in the weighting.

The following weighting characteristics of persons and households are:

At the household level:

At the person level:

  • State
  • Sex
  • AGF reception level
  • BIK Municipality Size Class
  • Political Municipality Size Class
  • Education
  • Household size
  • Age
  • Relationship to the Main Income Earner
  • Household-keeping person
  • Internet usage
  • Occupation
  • Platform access

Window programmes are TV programmes that are broadcast by regional providers on the frequencies of national broadcasters and replace the programmes of the main broadcaster on this frequency. They serve the purpose of regionalizing programming content.