What is the retention rate for the 2010-12-01 cohort in the 12th month after their first purchase?
What is the retention rate for the 2010-12-01 cohort in the 12th month after their first purchase?: a task in SmolDataEnvs-harbor-train-sandbox: 📊 SmolDataEnvs: Harbor (train) (Harbor dataset). Files (in /home/user/input, no subfolders): - data.csv
The task
Files (in /home/user/input, no subfolders): - data.csv