No there isn't because regional tam only monitors regional networks using only their ratings boxes, which are the samples, and are independent of oztams ratings boxes. Both bodies are completely separate from each other, with Neilson TAM compiling the data to form ratings estimates for both. Some population crossover occurs when extrapolating from the sample to the population to form ratings estimates in areas that are covered by both regional tam and oztam coverage maps.There's still crossover in the samples though in these metro regions. They aren't independent samples. So you simply can't just add the metro and regional figures together. Even the ratings agencies admit this.
The guidelines are clear and they say as long as they are reported as 'combined metro + regional' it can be used. The ABC have just announced from next year they will no longer report metro ratings and instead only report a combined metro and regional figure. It is certainly on the agenda and will likely be industry standard in the not to distant future.
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