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Thread ID: 39762 2003-11-16 22:47:00 Off Topic - TV Ratings Bambi (1486) Press F1
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192535 2003-11-16 22:47:00 Hi all. I often wonder how they know which channel and which program is popular. ?:|

How do they get these stats? They say for example, 1,000,000 people tuned in to watch a particular show at a particular time and channel. So how can they know this?

When they say half the nation tunes in to watch, like a one of special for the week. So does half the nation as they say tune in to watch the show or are they just esitimating it and taking a wild stab in the dark?

Any ideas?
Bambi (1486)
192536 2003-11-16 23:05:00 Its done by sampling a representative cross section of the public.

Its basically a poll, and its done according to recognised methodology to give a result +/- known % of accuracy.

Advertising rates are often based on the audience numbers so it has to have some basis of credibility.
godfather (25)
192537 2003-11-16 23:20:00 In fact advertising rates are always based on program popularity. If no-one is watching then you aren't going to have much chance selling that wonderful shampoo. So advertisers are not going to buy time in dead spots.

Surveys are taken of sample groups of the population to see when and what they watch. Actually monitoring devices are used by some survey firms that record exactly what your TV is tuned to every second. No way to pretend to watch the news but actually on Friends.

The sample methods are extremely important and computer modeled. I studied this in Maths and Stats many years ago but as I slept through the lectures, I can't tell you much more. ;)
Winston001 (3612)
192538 2003-11-16 23:51:00 > Actually monitoring devices are used by some survey firms that record exactly what
> your TV is tuned to every second. No way to pretend to watch the news but actually
> on Friends.

Just taking this thread a little of the original topic here - how exactly would something like that work? I know it's easy to trace the source of a signal like what the Nazi's did back during the war to find the signals which were been listened to by the French Resistance (or something like that) by using 2 vehicles and then finding the location of the strongest signal and then plotting it all out.
But how do you find out who's actually receiving a signal when it's been broadcast in 360 degrees because AFAIK receivers don't give off a signal saying we're here and we're receiving the broadcast?
cyberchuck (173)
192539 2003-11-16 23:53:00 > But how do you find out who's actually receiving a
> signal when it's been broadcast in 360 degrees
> because AFAIK receivers don't give off a signal
> saying we're here and we're receiving the broadcast?

Its done at the set. Hard wired. Its not done remotely.
godfather (25)
192540 2003-11-17 01:17:00 Selected people have a device at their house which keeps track of what channels they have been watching and at what times. -=JM=- (16)
192541 2003-11-17 01:36:00 Come on you Techoids, don`t tease this poor guy, it`s obvious that anyone who would want a box monitoring their viewing habits is the last person these statisticians would want to know about. There are some boxes out there but only for those who insist on having one, just to keep them calm and society safe. The real way they do it is to measure the station`s signal strength at various pre-set distances within a lead box ( stops interference). This is compared with a control strength taken when the nation sleeps and the difference represents the amount of signal sucked out by the sets tuned in. This works well for everything except the rugby for which viewer figures are estimated by the number of suicides when we lose. Cheers, hope this helps. brewer (4389)
192542 2003-11-17 02:50:00 I suppose Schrodinger's cat is in the box too. Winston001 (3612)
192543 2003-11-17 02:57:00 approx 420 sets accross the country Wayne H (1736)
192544 2003-11-17 03:21:00 GF's second post is the correct answer.

Of all I've seen in the workshop...

The hard wiring is done to the VCR... mainly.

The required info is passed via a landline connection.
OldEric (3062)
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