Gordon S. Linoff Founder Data Miners, Inc.
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1 Survival Data Mining Gordon S. Linoff Founder Data Miners, Inc.
2 What to Expect from this Talk Background on survival analysis from a data miner s perspective Introduction to key ideas in survival analysis hazards survival competing risks Lots of examples Stratification Quantifying Loyalty Effort Voluntary and Involuntary Churn Forecasting Time to Reactivation and Re-purchase 2
3 Who Am I? I am not a statistician Adept with databases and advanced algorithms Founded Data Miners with Michael Berry in 1998 We have written three books on data mining Have become very interested in survival analysis for mining customer data survival data mining 3
4 What Does Data Mining Really Do? Provides ways to quantitatively measure what business users know or should know qualitatively Connects data to business practices Used to understand customers Occasionally, produces interesting predictive models 4
5 Data Mining Is About Customers Customer Relationship Lifetime Prospect New Customer Established Customer Former Customer Events Initial Purchase Sign-Up 2nd Purchase Usage Failure to Pay Voluntary Churn Customers Evolve Over Time 5
6 The State of the Customer Relationship Changes Over Time Starts P1 Starts P1 P2 P1 P1 P2 STOP P1 P2 P1 P3 Starts P1 P3 P1 6 STOP
7 Traditional Approach to Data Mining Uses Predictive Modeling Jul Jan Feb Mar Apr May Jun Aug Sep Model Set Score Set Data to build the model comes from the past Predictions for some fixed period in the future Present when new data is scored Models built with decision trees, neural networks, logistic regression, regression, and so on
8 Survival Data Mining Adds the Element of When Things Happen Time-to-event analysis Terminology comes from the medical world which patients survive a treatment, which patients do not Can measure effects of variables (initial covariates or time-dependent covariates) on survival time Natural for understanding customers Can be used to quantify marketing efforts 8
9 Example Results (Made Up) 99.9% of Life bulbs will last 2000 hours Mean-time-to-failure for hard disk is 500,000 hours A recent study published in the American Journal of Public Health found that life expectancy among smokers who quit at age 35 exceeded that of continuing smokers by 6.9 to 8.5 years for men and 6.1 to 7.7 years for women. [ ] Example of initial covariate Stopping smoking before age 50 increases lifespan by one year for every decade before
10 Original Statistics Life table methods used by actuaries for a long, long time These the are the methods we will be focused on Applied with vigor to medicine in the mid-20th Century Applied with vigor to manufacturing during 20th Century as well Took off with Sir David Cox s Proportion Hazards Models in 1972 that provide effects of initial covariates 10
11 Survival for Marketing Has Some Differences We are happy with discrete time (probability vs rate) Traditional survival analysis uses continuous time Marketers have hundreds of thousands or millions of examples Traditional survival analysis might be done on dozens or hundreds of participants We have the benefit of a wealth of data Traditional survival analysis looks at factors incorporated into the study We have to deal with window effects due to business practices and database reality Traditional survival ignores left truncation 11
12 To Understand the Calculation, Let s Focus on the End of the Relationship START tenure is the duration of the relationship STOP Challenge defining beginning of customer relationship Challenge defining end of customer relationship Challenge finding either in customer databases 12
13 How Long Will A Customer Survive? Percent Survived 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Tenure (months) 84 High End Regular Survival always starts at 100% and declines over time If everyone in the model set stopped, then survival goes to 0; otherwise it is always greater than 0 Survival is useful for comparing different groups 13
14 Key Idea: Data is Censored Known tenure when customers stop Known Customer Start time 14 Unknown tenure for active customers (censored)
15 Use Censored Data to Calculate Hazard Probabilities Hazard, h(t), at time t is the probability that a customer who has survived to time t will not survive to time t+1 h(t) = # customers who stop at exactly time t # customers at risk of stopping at time t Value of hazard depends on units of time days, weeks, months, years Differs from traditional definition because time is discrete hazard probability not hazard rate 15
16 Bathtub Hazard (Risk of Dying by Age) 3.0% 2.5% 2.0% 1.5% 1.0% 0.5% 0.0% 16 Bathtub hazard starts high, goes down, and then increases again Example from US mortality tables shows probability of dying at a given age 0-1 yrs 1-4 yrs 5-9 yrs yrs yrs yrs yrs yrs yrs yrs yrs yrs yrs yrs Haz ard yrs yrs Age (Years)
17 Hazards Are Like An X-Ray Into Customers Hazard (Daily Risk of Churn) 0.30% 0.25% 0.20% 0.15% 0.10% 0.05% 0.00% Peak here is for nonpayment and end of initial promotion Tenure (Days) Bumpiness is due to within week variation 17
18 Hazards Can Show Interesting Features of the Customer Lifecycle Daily Churn Hazard 8% 7% 6% 5% 4% 3% 2% Peak here is for nonpayment after one year Peak here is for nonpayment after two years 1% 0% Tenure (Days After Start) 18
19 How Long Will A Customer Survive? Survival analysis answers the question by rephrasing it slightly: What proportion of customers survive to time t? Survival at time t, S(t), is the probability that a customer will survive exactly to time t Calculation: S(t) = S(t 1) * (1 h(t 1)) S(0) = 100% Given a set of hazards by time, survival can be easily calculated in SAS or a spreadsheet 19
20 Survival is Similar to Retention Retention/Survival 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Retention is jagged. It is calculated on customers who started exactly w weeks ago Tenure (Weeks) Survival is smooth. It is calculated using customers who started up to w weeks ago. 20
21 Why Survival is Useful Compare hazards for different groups of customers Calculate median time to event How long does it take for half the customers to leave? Calculate truncated mean tenure What is the average customer tenure for the first year after starting? For the first two years? Can be used to quantify effects 21
22 Median Lifetime is the Tenure Where Survival = 50% 100% 90% Percent Survived 80% 70% 60% 50% 40% 30% 20% 10% 0% High End Regular Tenure (months)
23 Average Tenure Is The Area Under The Curves 100% 90% 80% Percent Survived 70% 60% 50% 40% 30% 20% 10% average 10-year tenure regular customers = 44 months (3.7 years) High End Regular average 10-year tenure high end customers = 73 months (6.1 years) 0% Tenure
24 Survival to Quantify Marketing Efforts A company has a loyalty marketing effort designed to keep customers This effort costs money What is the value of the effort as measured in increased customer lifetimes? SOLUTION: survival analysis How much longer to customers survive after accepting the offer? How to quantify this in dollars and cents? 24
25 Loyalty Offers is an Example of a Time- Dependent Covariate Non-Responders have no loyalty date Responders have a loyalty date Open Circle indicates that customer has stopped before (or on) the analysis date time Time = 0 Time = n Time c 25
26 We Can Use Area to Quantify Results 100% Percent Retained 95% 90% 85% 80% 75% 70% How much is this difference worth? 65% Group 1 Group Months After Intervention Chart shows survival after loyalty offer acceptance compared to similar group not given offer 26
27 We Can Use Area to Quantify Results Percent Retained 100% 95% 90% 85% 80% 75% 70% 65% 0 2 Group 1 Group % 85.6% Months After Intervention Increase in survival is given by the area between the curves. For the first year, area of triangle is a good enough estimate Note: there are easy ways to calculate the exact value 27
28 Loyalty-Responsive Customers Are Doing Better Than Others Survival for first year after loyalty intervention Group 1: 93.4% Group 2: 85.6% Increase for Group 1: 7.8% Average increase in lifetime for first year is 3.9% (assuming the 7.8% would have stayed, on average, 6 months) Assuming revenue of $400/year, loyalty responsive contribute an additional revenue of $15.60 during the first year This actually compares favorably to cost of loyalty program 28
29 Competing Risks: Customers May Leave for Many Reasons Customers may cancel Voluntarily Involuntarily Migration Survival Analysis Can Show Competing Risks overall S(t) is the product of S r (t) for all risks We ll walk through an example Overall survival Competing risks survival Competing risks hazards Stratified competing risks survival 29
30 Overall Survival for a Group of Customers 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% Sharp drop during this period, otherwise smooth Overall 0%
31 Competing Risks for Voluntary and Involuntary Churn 100% 90% 80% 70% 60% 50% 40% 30% Steep drop is associated with involuntary churn Involuntary Voluntary Overall 20% 10% 0% Survival for each risk is always greater than overall survival
32 What the Hazards Look Like 9% 8% 7% As expected, steep drop has a very high hazard Involuntary Voluntary 6% 5% 4% 3% 2% 1% 0%
33 Most Involuntary Churn is from Non Credit Card Payers 100% 90% 80% 70% 60% 50% Involuntary-CC Voluntary-CC Involuntary-Other Voluntary-Other Steep drop associated only with non-credit card payers 40% 30% 20% 10% 0%
34 Time to Reactivation When a customer stops, often they come back this is winback or reactivation In this case, the initial condition is the stop The final condition is the restart Not all customers restart 34
35 Survival Can Be Applied to Other Events: Reactivation 100% 10% 90% 9% Survival (Remain Deactivated) 80% 70% 60% 50% 40% 30% 20% 10% 8% 7% 6% 5% 4% 3% 2% 1% Hazard Probability ("Risk" of Reactivating) 0% 0% Days After Deactivation 35
36 Time to Next Order In retailing type businesses, customers make multiple purchases Survival analysis can be applied here, too The question is: how long to the next purchase? Initial state is: date of purchase Final state is: date of next purchase It is better to look at 1 survival rather than survival 36
37 Time to Next Purchase, Stratified by Number of Previous Purchases 50% 45% 40% 35% 30% 25% 20% 15% 10% 5% 05--> > > >03 ALL 01-->02 0%
38 Customer-Centric Forecasting Using Survival Analysis Forecasting customer numbers is important in many businesses Survival analysis makes it possible to do the forecasts at the finest level of granularity the customer level Survival analysis makes it possible to incorporate customer-specific factors Can be used to estimate restarts as well as stops 38
39 Using Survival for Customer Centric Forecasting Number Actual Predicted Day of Month 39
40 The Forecasting Solution is a Bit Complicated Existing Customer Base New Start Forecast Existing Customer Base Forecast Do Existing Base Forecast (EBF) Do Existing Base Churn Forecast (EBCF) Do New Start Forecast (NSF) Do New Start Churn Forecast (NSCF) New Start Forecast Churn Forecast Churn Actuals Compare 40
41 Survival Data Mining Connects Data to Business Needs Provides ways to quantitatively measure what business users know or should know qualitatively Connects data to business practices Techniques such as survival analysis provide new ways of looking at customers Techniques such as customer-centric forecasting integrate data mining with business processes such as forecasting 41
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