On the contrary, in two-stage (cluster) sampling, simple random sampling is applied within each cluster to select a subsample of elements in each cluster. Cluster sampling starts by dividing a population into groups, or clusters. In cluster sampling, the sampling unit is the whole cluster; Instead of sampling individuals from within each group, a researcher will study whole clusters. Cluster sampling is a probability sampling technique where researchers divide the population into multiple groups (clusters) for research. Cluster sampling is a two-step procedure. A sample size of 6 is needed, so two of the complete strata are selected randomly (in this example, groups 2 and 4 are chosen). There are primarily two methods of sampling the elements in the cluster sampling method: one-stage and two-stage. The cluster sampling method must not be confused with stratified sampling. A random sample of these groups is then selected to represent a specific population. In cluster sampling, groups of elements that ideally speaking, are heterogeneous in nature within group, and are chosen randomly.Unlike stratified sampling where groups are homogeneous and few elements are randomly chosen from each group, in cluster sampling the group with intra group heterogeneity are developed and all the elements within the group become a pan of the sample. The use of the technique requires the division or classification of the population into groups, defined by their assorted characteristics or qualities. Cluster sampling is defined as a sampling technique in which the population is divided into already existing groupings (clusters), and then a sample of the cluster is selected randomly from the population. All the members of the selected clusters together constitute the sample. These groups are then called clusters. Cluster sampling is commonly used for its practical advantages, but it has some disadvantages in terms of statistical validity. The clusters should ideally each be mini-representations of the population as a whole. Then, you randomly selecting entire clusters to sample. Cluster sampling, a cost-effective method in comparison to other statistical methods, refers to a variant of sampling method in which the researchers rather than looking at the entire set of the available data, distribute the population into individual groups known as clusters and select random samples from the population to analyze and interpret results. It is a design in which the unit of sampling consists of multiple cases e.g. Researchers usually use pre-existing units such as schools or cities as their clusters. Cluster sampling is a probability sampling method in which you divide a population into clusters, such as districts or schools, and then randomly select some of these clusters as your sample. Random samples are then chosen from these subgroups. What is the definition of cluster sampling?It’s a sampling method used when assorted groupings are naturally exhibited in a population, making random sampling from those groups possible. Image Created by Author. In stratified sampling, the population is divided into the mutually exclusive groups th… Cluster sampling is also known as area sampling. In one-stage (cluster) sampling, all elements in each selected cluster are sampled. What makes this different that stratified sampling is that each cluster must be representative of the population. Some authors consider it synonymous with multistage sampling. Advantages. Definition: Cluster sampling studies a cluster of the relevant population. Cluster random sampling is a sampling method in which the population is first divided into clusters (A cluster is a heterogeneous subset of the population). Cluster sampling is a sampling method where populations are placed into separate groups. Because cluster sampling uses randomization, if the population is clustered properly, … It is a process which is usually used for market research when there is no feasible way to find information about a population or demographic as a whole. First, the entire population is selected and separated into different clusters. In the image below, the strata are natural groupings by head color (yellow, red, blue). Then a simple random sample of clusters is taken. Cluster sampling is commonly used for market research because of its ability to help account for the common interest of a larger population at … Researchers then select random groups with a simple random or systematic random sampling technique for data collection and data analysis. The term cluster refers to a natural, but heterogeneous, intact grouping of the members of the population. Cluster sampling is time- and cost-efficient, especially for samples that are widely geographically spread and would be difficult to properly sample otherwise. Cluster sampling is a method of probability sampling that is often used to study large populations, particularly those that are widely geographically dispersed. a family, a class room, a school or even a city or a school system. This method is often used when natural groupings are obvious and available.