There are two main possibilities to calculate percentage changes:

### 1. The Rate of Change analysis

Set the Method as “Change over period %”, and then choose the length.

### 2. Formula

You can also calculate percentage change over period with the formula:

cop(series, length)

Examples for Y/Y, M/M and Q/Q changes, respectively:

cop(segdp, YearsLength(1)) cop(segdp, MonthsLength(1)) cop(segdp, QuartersLength(1))