Percent change (rate of change) — the percent difference from periods
bars ago: (value / value[i − periods] − 1) × 100. Appends one column;
undefined for the first periods rows (no look-back) and where the prior
value is 0/missing. periods counts bars, so it's gap-correct on a
trading axis.
Percent change (rate of change) — the percent difference from
periodsbars ago:(value / value[i − periods] − 1) × 100. Appends one column;undefinedfor the firstperiodsrows (no look-back) and where the prior value is0/missing.periodscounts bars, so it's gap-correct on a trading axis.