Retention Rate
The percentage of users, customers, knowledge, or information that is successfully retained over a specific period of time.
Also known as: Customer Retention Rate, User Retention, Knowledge Retention Rate
Category: Business & Economics
Tags: metrics, business, learning, knowledge-management, psychology
Explanation
Retention rate measures the proportion of something—customers, users, employees, knowledge, or information—that persists over a given period. It is the inverse of churn: if 90% of customers remain after a month, the retention rate is 90% and the churn rate is 10%.
**Applications across domains:**
**Business:**
- **Customer retention rate**: The percentage of customers who continue using a product or service. A 5% increase in customer retention can increase profits by 25-95% (Bain & Company)
- **Employee retention rate**: The percentage of employees who remain with an organization. High retention reduces hiring and training costs
- **Revenue retention rate**: Net revenue retained from existing customers, including expansions and contractions
**Learning and memory:**
- **Knowledge retention rate**: How much learned information is remembered over time, governed by the forgetting curve
- **Training retention**: Percentage of training content that employees can apply on the job (typically only 10-20% without reinforcement)
- **Spaced repetition**: Optimizes retention rates by timing reviews at the point of forgetting
**Information systems:**
- **Data retention**: How long data is kept in systems before archival or deletion
- **Content retention**: How much of consumed content (articles, videos, podcasts) is remembered and usable
**Measuring retention:**
- **Cohort analysis**: Track groups of users/customers who started at the same time to see how retention changes over time
- **Retention curves**: Plot retention rate against time to visualize decay patterns
- **Rolling retention**: Percentage of users active on or after a specific day post-acquisition
- **Bracket retention**: Percentage of users active during a specific time window
**Improving retention:**
- **Business**: Improve onboarding, increase engagement, build switching costs, deliver continuous value
- **Learning**: Use spaced repetition, active recall, elaborative encoding, and real-world application
- **Information**: Build PKM systems, take notes, teach others, connect new knowledge to existing knowledge
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