You can't. Which is why no one applies percentage error to data whose value is expected to be zero.
Edit: fixed amusing typo.How do you calculate percentage error when the actual (expected) value is 0? Dividing by zero is N/A!?
I had problems with this too.
Dividing by 0 = undefine
Undefine just tells you that there is no definite answer, but for a certain situation there will be one.
You might not have seen the 2nd half of my statement, but that's what I believe is the definition of undefine.
Suppsoe you had an apple. You share it to no one, not even yourself. How much of an apple is shared?
apple / people
people = 0
apple / 0 = 0 apple
There will be different situations.
Answer using your logic. It'll work out.
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