Compute percent increase and decrease between an original and a new value.
计算数值变化的百分比。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Percent change | Percent change = (new - old)/old × 100% | ISO 80000-1:2009, Quantities and units - Part 1: General |
| Sign convention | A positive result means an increase; a negative result means a decrease | ISO 80000-1:2009, Quantities and units - Part 1: General |
| Percent change vs. percentage points | Percent change is relative; percentage points are an absolute difference of two percentages | ISO 80000-1:2009, Quantities and units - Part 1: General |
| Compounded change | Two successive changes r1 and r2 compound to (1 + r1)(1 + r2) - 1, not r1 + r2 | CFA Institute, Global Investment Performance Standards (GIPS) |