You can also continue this procedure, taking progressively smaller and smaller random samples, which is usually called multistage sampling. You should use this method when it is infeasible or too expensive to test the entire cluster. Example: Multistage samplingInstead of collecting data from every ...
the groups are not fully representative or interchangeable. Randomly sampling the subjects from the groups helps reduce thebiasthat these conditions cause. However, it increases the time and cost associated with the sampling plan relative
Cluster sampling is a probability sampling technique where researchers divide the population into multiple groups (clusters) for research. So, researchers then select random groups with a simple random or systematic random sampling technique for data collection and unit of analysis. Example: A researcher...
Example of Two-Stage Cluster Sampling A garment manufacturer has N = 90 plants located throughout the United States and wants to estimate the average number of hours that the sewing machines were down for repairs in the past months. Because the plants are widely scattered, she decides to ...
If the example had been a survey in which 30 clusters were selected rather thanthree, it would have followed the design of the Expanded Program on Immunization (EPI) of theWorld Health Organization. The second survey is shown Figure 5-2. Here three clusters are alsoselected with PPS sampling...
What is Cluster Sampling? In cluster sampling, you split the population into groups (clusters), randomly choose a sample of clusters, then measure each individual from each selected cluster. The most common and obvious example of cluster sampling is when school children are sampled. An example I...
What is thesamplingpopulation for this study? Do you think thissamplingprocedure results in a representative sample of households with children? Why‚ or why not? Solution: This is aclustersample because all the elements within theclustersare selected. (Example: All ...
The important thing to remember about this sampling technique is to give all the clusters equal chances of being selected. Types of Cluster Sample One-Stage Cluster Sample Recall the example given above; one-stage cluster sample occurs when the researcher includes all the high school students from...
With one-stage cluster sampling, the formula for the standard error reduces to: SE = N * sqrt { [ ( 1 - n/N ) / n ] * s2b/n }Think of the standard error as the standard deviation of a sample statistic. In survey sampling, there are usually many different subsets of the ...
Jump-starting Assisted Review - Locate good training examples for judgmental sampling in Assisted Review.See these related pages:Clustering Visualizing a cluster Cluster visualization is integrated with the Documents tab, so you can add a cluster visualization widget directly to your Dashboard. ...