this post was submitted on 14 Apr 2026
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You Should Know

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Explanation:
The crime rate statistic shows the number of registered crimes divided by the number of registered residents in a country or area.
"Registered" is important here!

If you add undocumented immigrants to the calculation, the statistic is skewed:
Undocumented immigrants aren't registered as residents for the statistic, since they are, well, undocumented.
However, any crime committed by any one of them will count towards the crime rate when they're registered by the police.

So even if they were much less likely to commit crime than the resident population on average, the crime rate statistic would still increase. The denominator of the equation doesn't increase by definition, because only legal residents are counted towards the statistic. But the real number of people inside the country who may commit crimes increases.

This is important to know as context when people try to "prove" immigrants are more criminal than citizens, using the crime rate statistic.

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I wouldn't call this so much a statistical error but a human one. While the exact number may be unknown, somebody with a pencil sat down somewhere and counted some beans on a sample, which a math whiz can extrapolate to get to a total population number that's closer to the truth.

Never trust a statistic, which you haven't forged yourself.