{
  "countries": [
    "USA",
    "Germany",
    "India",
    "Brazil",
    "Kenya",
    "France",
    "China",
    "Japan"
  ],
  "occupations": [
    "student",
    "engineer",
    "teacher",
    "doctor",
    "artist",
    "farmer",
    "manager",
    "freelancer"
  ],
  "attributes": {
    "gender": {
      "male": 0.5,
      "female": 0.5
    },
    "age": {
      "25": 0.3,
      "40": 0.4,
      "60": 0.3
    },
    "politics": {
      "liberal": 0.3,
      "moderate": 0.3,
      "conservative": 0.4
    },
    "income": {
      "low": 0.3,
      "middle": 0.5,
      "high": 0.2
    },
    "education": {
      "high school": 0.5,
      "university": 0.4,
      "graduate": 0.1
    }
  },
  "note": "country/occupation are uniform, non-stratified randomization fields; not part of the 162-persona key."
}