YZed said...
With all these media related types in this thread, I'm sure somebody can tell me how the channels get their ratings and work out how many people watch their shows. Surely they have no way of telling every time you change channel. Do they rely on phone ins, do they have a roomfull of people in India randomly calling households, asking what channel you're wathcing?
The link that Gizmo put up is only relevant for some regional markets like SA and NT. All major cities and other regional areas are done by people metres. Nielsen use census data to figure out what the population make up is and distribute these metres so that they get a true representation of the population. Obviously not everyone gets a metre so there is some scaling that goes on, but the data they receive is indicitive of the entire population of that market. People are given incentives to take part and if you are seen to only be watching one station you get a please explain and possibly taken out of the sample. The ratings data can come in a number of different forms, minute by minute, 15 minute averages or averaged for the program. To register that you are watching a station you have to be watching for atleast 1 minute at the bottom of the minute, if you have a metre that is.