Stratified Sampling
Domain: Data & Datasets
🎯 Motivation
Sampling that maintains the proportion of each category. Ensures balanced representation.
📋 Concrete Example
Stratified: original data is 60% sports, 40% news. Sample 1000: 600 sports, 400 news. Proportions maintained. No category is underrepresented.
🔗 Analogy
A school survey that samples proportionally from each grade - 30% F1, 25% F2, 25% F3, 20% F4. Each grade is fairly represented.