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.
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