I would like to select random sample from my data set on following conditions
- Two sites site A=850and site B=900
- **1• 20% 0-<2y
- **2• 20% 2-<5y
- **3• 20% 5-<10y
- **4• 20% 10-<15y
- **5• 20% 15-<25y
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