Ratings surveys in which local markets are simultaneously measured by a rating service. Nielsen Media Research surveys all 210 local television markets in November, February, May and July. These months are known as sweep months, and the data are used by local stations and cable systems to set local ad rates and to make program decisions.
The periods in February, May, July and November, highly important to stations and advertisers, during which TV ratings firms track viewership -- by households and demographics -- most closely. Advertising rates are set by audience delivered.
The monthlong periods, usually in February, May, July and November, when Nielsen Media Research measures audiences in all television markets. These periods are important to local stations because they provide comparative ratings across the nation and important to networks because they provide an indepth view of their audience. Advertising sales for the upcoming programming season are heavily affected by the outcome of the sweeps.
Aerial surveys done by dragonriders to ensure that no Thread has burrowed into the ground.
The four periods during each year when Arbitron and Nielson gather audience data for the entire country: November (fall season ratings become base for rest of the year); February (fall season programs again plus replacements); May (end of year ratings); July (summer replacements). The ratings on the sweeps determine network and station rates for advertising time until the next sweep.
A period, usually in February, May, July and November, where the A C Neilson Company undertakes to record the ratings of all shows in all markets with all demographics. This allows networks and local stations to spot surprise hits and unexpected failures. It is also a time when a successful network will try pilot episodes of new shows, whilst a failing network will often put existing successful programs in place of poorly performing shows to boost average ratings.
the 4 week period held 4 times per year by Nielsen where all U.S. TV stations are measured for viewership levels and demographic breakdown.
Sweeps is an episode of That's So Raven.