Have you ever met some indicator which has been created basing on data from specific area and then has been used for calculating the value in different area despite the fact, that the result might be less accurate than in the origin area?

Example: In the City of Boston (USA) an indicator for the forecast of the increase of air pollution has been invited. It bases on the population density, the degree of city ventilation and the area of green spaces. Let's call it 'The Boston Indicator'. Someone in Tokio uses this indicator for his city, despite the fact that the city ventilation has smaller role than in Bostone. Nevertheless the indicator is still good enough.

For sure there are alot of similar situation in the real world but I cannot remind myself any fo them. Are you able to help me?

I hope my question is quite clear - if not,please don't hesitate to ask a question.

Thanks in advance!

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