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. In the AGF system, watermarking is used for the detection of crossfades (addressable TV).

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 was an online application developed by DAP GmbH on behalf of AGF Videoforschung. The focus of WEBCROSS was the visualization of convergent usage data from AGF, which included TV data (30-minute increments) as well as video streaming data (offer unit level). With the deployment of AGF SCOPE 2023, WEBCROSS was discontinued.

Factor per person or household to compensate for structural differences between sample and universe. Weight is calculated daily as a function of the reporting mass. Weight can be adjusted to suit calculation needs for long-term person observations. Weight also includes the projection factor for projecting the sample survey on the universe.

The panel households are distributed across Germany, with at least 213 representative TV households available in each federal state. This ensures that there are sufficient households in even smaller federal states, enabling the inclusion of local TV providers.

The associated disproportionate distribution of households in the federal states is balanced out through daily weighting.

The non-TV households in the AGF panel are distributed across the four regions: North, South, East, and West, due to the lower number of cases.

The weighting process occurs in two steps:

• The preliminary weighting is performed daily, after GfK has transmitted and verified the data retrieved during the night.
• The final weighting is done eight days later, when the additional households retrieved during this period are incorporated, and the preliminary weighting factors are replaced by the final factors. Additionally, time-shifted usage from the past three days is taken into account.

The weighting process ensures precise extrapolation to all TV and video households and all individuals age 3 or over living in them throughout Germany.

Weighting characteristics are features used to weight individuals or households in the AGF panel. A range of regional, sociodemographic, and usage-specific household and individual characteristics are included in the weighting of TV households or individuals in TV households in the AGF panel:

At the household level:

• Federal state, BIK Municipality Size Classes, political municipality size class
• Household size, children yes/no
• Age and education of the primary income earner (PIE)
• Reception/technical equipment: TV device ownership, AGF Reception levels, platform access, Sky packages

At the individual level:

• Federal state, BIK Municipality Size Classes, political municipality size class
• Age, gender, education, employment status
• Internet usage (by device type)
• Household information (household size, AGF Reception levels, platform access, Sky packages)
• Relationship to the MIP (Main Income Person)
• HKP (Household-Keeping Person)

The weighting of the significantly smaller group of non-TV households or individuals in non-TV households is carried out separately in a weighting run with a reduced matrix set.

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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.