RTC/OM HCBS Measurement Education Modules
Cluster sampling (large-scale studies)
- Examples of clusters would be: geographic groups, provider agencies or other distinct information clusters, counties, regional offices
- When establishing a cluster sample:
- The population is first divided into clusters based on group membership.
- Then, some clusters are randomly selected to recruit participants within.
- Finally, a simple random sampling process is conducted within each of the randomly selected clusters.
- Cluster sampling is often used when sampling all groups/clusters would not be feasible
- Example: An HCBS provider with 94 group homes (clusters) serving adults with IDD selects 45 of the homes to randomly recruit participants within for a measurement effort.