Probability Sampling
Simple random sample
- List the elements in the sampling frame and use a random number chart to select elements.
Systematic sampling
- List the elements in the sampling frame and take every Nth element, based on how many needed in sample.
- Warning: Be attentive to any inherent patterns in how sampling frame is ordered.
Stratified sampling
- Draw appropriate proportion of elements from homogeneous groups interested in (based on theory).