For example, clusters may be schools, hospitals, or geographical areas, and the final sampling units may be students, patients, or citizens. Cluster sampling can provide efficiencies in frame ...

For example, if you are doing a survey of healthcare in different regions, you would grant a percentage of sample units based on the population of each area.

Primary Sampling Units (PSUs) When you have clusters, or primary sampling units (PSUs), in your sample design, the procedure estimates variance from the variation among PSUs. For more information, see ...

Solution E Instruments has designed a Sample Conditioning Unit mounted right at the sampling probe exit before the sampling hose, where the water can rapidly condense and separate immediately from ...