Is the sentence below correct?

It is calculated as the ratio of real errors comparing to all detected errors.


It depends on the context. I'd say that you'd typically want to use "compared to" instead of "comparing to", since you're talking about two different sides of a ratio, but it's possible that certain technical contexts you might want to talk about a ratio between comparisons themselves, which is when you'd use "comparing to" for each comparison that you're making a ratio from.

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