sampling

1. MULTI STAGE OF CLUSTER
SAMPLING

2.  MEANING:
 Splitting the population into similar parts or clusters can make
sampling more practical.Then we could select one or a few
clusters at random and perform a census within each of
them.This sampling design is called cluster sampling.
 Clusters are more or less alike, each heterogeneous and
resembling the overall population.We select clusters to make
sampling more practical or affordable.

3. Cluster sampling
Cluster 4
Cluster 5
Cluster 3
Cluster 2Cluster 1

4.  Types:
 One stage – when all units in the selected cluster are selected.
 Two stage – only some units from a selected cluster are taken using
simple random or systematic random sampling.
 Advantages
 Simple as complete list of sampling units within population not required
 Low cost
 Can estimate characteristics of both cluster and population
 Less travel/resources required
 Disadvantages
 Potential problem is that cluster members are more likely to be alike,
than those in another cluster (homogenous).
 Each stage in cluster sampling introduces sampling error—the
more stages there are, the more error there tends to be
 Usually less expensive than SRS but not as accurate
Cluster sampling (contd.)

5. CEB
WARD
HOUSHOLD

6. THANK YOU