Sampling method used in assessing immunization status of children under immunization programme is -
Ans. is 'd' i.e., Cluster sampling Important facts of cluster random sampling (CRS)o Cluster sampling is used in India to evaluate immunization coverage.o WHO used 39 x 7 technique (total = 210 children) for cluster sampling in which there are 30 clusters, each containing 7 children who are 12 - 23 months old and are completely immunized for primary immunization (till measles vaccine at 9 month)o Clusters are heterogenous within themselves but homogeneous with respect to each othero Main objective of cluster sampling is to reduce costs by increasing sampling efficiency; in contrast to stratified sampling where; the main objective is to increase precision.o Cluster sampling is quiet accurate with low error rate of only +- 5%.o Cluster sampling can also calculate sampling interval.o The main limitation of cluster sampling is that cluster cannot be compared with each other.
Systemic sampling
Stratified sampling
Group sampling
Cluster sampling
Biostatistics