The term percent change is commonly used to describe $\frac{new - old}{old}\times 100$ which is the fraction of the old value by which it has grown. There is a related concept which is $\frac{new - old}{new}\times 100$ which is the fraction of the new value which is attributed to the change. Is there a common term for this?
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I know exactly what you mean, but I haven't ever seen a term for it – DWD Jun 28 '17 at 21:02
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Percentage change = $\frac{new - old}{old}\times 100$
From my experience and research, there is not a common term for: $\frac{new - old}{new}\times 100$.
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That being said, I'd like to stake my claim and coin the corresponding term. It is to be known thus, as percentage change with respect to the new value.
DWD
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Ya, it is super common concept, and I feel like there really should be an existing term. When discussing growth like this, one would usually say that "X grew 100% from 25 to 50", but there should be a concept of "50% of the current value of X was due to change". – DRayX Jun 29 '17 at 00:42
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This is commonly called the relative change, which may (but need not) be expressed as a percentage. The difference new - old is the absolute change.
Ethan Bolker
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