| Active customers | Number of customers whose recency is less than the length of the company-defined inactivity period | |
| Newly inactive | Number of customers whose recency exceeded the length of the company-defined inactivity period during the last quarter | |
| 1x buyers | Percent of one-time buyers compared to number of active buyers | |
| 2x buyers | Percent of active customers who have made exactly two purchases | |
| Cycle time | Average inter-order wait time in days | |
| Multiple products buyers | Percent of customers who have bought multiple products from the product set |
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| Inactive ratio | Ratio of newly inactive customers to new customers. Something <= 1 is desireable, meaning more new customers acquired than defectors lost | |
| Active customer growth | Percent change in number of active customers. Measures true growth of customer population | |
| New customers | Percent of active customers who made their first purchase in the most recent period. Measures composition of the customer population between new and existing customers | |
| New customer revenue | Percentage of current revenue coming from customers who made their first purchase in the current period | |
| Existing customer revenue | Percentage of current revenue coming from customers who made their first purchase in an earlier period | |
| Current purchasers | Percent of existing customers who made a purchase in the most recent period. Measures rate of buying by existing customers |