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Sample size and power calculations - Columbia …
CHAPTER 20 Sample size and power Choices in the design of data collectionMultilevel modeling is typically motivated by features in existing data or the objectof study for example, voters classified by demography and geography, students inschools, multiple measurements on individuals, and so on. Consider all the examplesin Part 2 of this book. In some settings, however, multileveldata structures ariseby choice from the data collection process. We briefly discuss some of these sampling or cluster samplingIn a Sample survey, data are collected on a set of units in order to learn about a largerpopulation. In unit sampling, the units are selected directly from the population. Incluster sampling, the population is divided into clusters:first a Sample of clustersis selected, then data are collected from each of the sampling, complete information is collected within each sam-pled cluster.
CHAPTER 20 Sample size and power calculations 20.1 Choices in the design of data collection Multilevel modeling is typically motivated by features in …
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