**ROC - Rate of change**

The rate of change (ROC) is the rate at which a price changes over a specified period.

Rate of Change (ROC) = (Price[0] - Price[-n]) / Price[-n]

**ROCP - Rate of change percentage**

This simply multiplies ROC * 100.

**ROCR - Rate of change ratio**

This is ratio of current price over previous period price

ROCR = Price[0] / Price[-n]

**ROCR100 - Rate of change ratio 100 scale**

ROCR100 = ROCR * 100 or Price[0] / Price[-n] * 100