Customer Retention Cohorts

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  "data": {"values":[
    {"c":"2025-08","m":0,"r":1.00},{"c":"2025-08","m":1,"r":0.82},{"c":"2025-08","m":2,"r":0.71},{"c":"2025-08","m":3,"r":0.62},{"c":"2025-08","m":4,"r":0.58},{"c":"2025-08","m":5,"r":0.55},
    {"c":"2025-09","m":0,"r":1.00},{"c":"2025-09","m":1,"r":0.84},{"c":"2025-09","m":2,"r":0.74},{"c":"2025-09","m":3,"r":0.65},{"c":"2025-09","m":4,"r":0.61},
    {"c":"2025-10","m":0,"r":1.00},{"c":"2025-10","m":1,"r":0.86},{"c":"2025-10","m":2,"r":0.77},{"c":"2025-10","m":3,"r":0.70},
    {"c":"2025-11","m":0,"r":1.00},{"c":"2025-11","m":1,"r":0.88},{"c":"2025-11","m":2,"r":0.80},
    {"c":"2025-12","m":0,"r":1.00},{"c":"2025-12","m":1,"r":0.90},
    {"c":"2026-01","m":0,"r":1.00}
  ]},
  "mark":"rect",
  "encoding":{
    "y":{"field":"c","type":"ordinal","title":"Cohort"},
    "x":{"field":"m","type":"ordinal","title":"Months since signup"},
    "color":{"field":"r","type":"quantitative","scale":{"scheme":"viridis","domain":[0.4,1]}},
    "tooltip":[{"field":"r","type":"quantitative","format":".0%"}]
  },
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