Local People Meter Markets: Collects tuning and viewing information from the installed households and the persons within them for 365 days annually.
Set Metered Markets: Set Meter Markets utilize meters to collect the set tuning data, i.e., what is being watch 365 days a year. Viewership within those homes is then married through “viewer assignment” to national and local people meter homes in the same time zone to impute demographics. Demographics are available for all 12 measurement periods.
Code-Reader Markets: The methodology uses audio “code reader” technology, which is plugged in nearby but not attached to the TV set, to detect household viewership. The same “viewer assignment” model used in set meter markets is also used in code reader markets to impute demographics. Demographics are available for all 12 measurement periods.
Diary Markets: Measured using diaries only. The diary is a one-week collection tool which is provided for each set within the sample households. Markets are measured four times a year: February, May, July and November.
Local Media Market Measurement Types (PDF)