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But if we put the wrong numbers in, we won't get the right numbers out.

This sort of prediction depends on the data being good. That's not a given. Even the crime statistics are problematic. There is an issue with certain groups getting treated differently in arrests and convictions.

So you could have an area that doesn't have much crime reported because when crime happens it's not reported as crime. Whereas you can have other areas that have a lot more crime reported because there is less leniency given to the population.