Percentage error questions and answers pdf
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Percent error example
Percentage error pdf.
Percentage Difference,
Percentage Error,
Percentage Change
They are very similar ...
They all show a difference between two values as a percentage
of one (or both) values
- Use Percentage Change when comparing an Old Value to a New Value
- Use Percentage Error when comparing an Approximate Value to an Exact Value
- Use Percentage Difference when both values mean the same kind of thing (one value is not obviously older or better than the other).
(Refer to those links for more details)
How to Calculate
Step 1: Subtract one value from the other
Step 2: Then divide by ...
what?
- Percentage Change: Divide by the Old Value
- Percentage Error: Divide by the Exact Value
- Percentage Difference: Divide by the Average of The Two Values
Step 3: Is the answer negative?
- Percentage Change: a positive value is an increase, a negative value is a decrease.
- Percentage Error: ignore a minus sign (just leave it off), unless you want to know if the error is under or over the exact value
- Percentage Difference: ignore a minus sign, because neither value is more important, so being
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