Deceleration is the rate at which a customer’s velocity (rate of purchasing) is slowing down. A customer’s deceleration percentile is where a customer’s deceleration ranks among all customers. A deceleration percentile of 97% means that only 3% of all customers are decreasing their purchasing at a higher rate. A customer with a deceleration percentile less than 50 is actually accelerating, buying at a faster rate than previously. Activate this metric with caution. Just because a customer is accelerating does not mean the customer won’t defect.