Question

which error does not have unit​

Answer 1

Answer:

Relative error (RE) — when used as a measure of precision — is the ratio of the absolute error of a measurement to the measurement being taken. In other words, this type of error is relative to the size of the item being measured. RE is expressed as a percentage and has no units.

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Answer 2

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Relative error doesn't have any unit because it is the ratio of two errors.

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