Chapter 2. Understanding Data
Populations, Processes, and Samples 20
Representativeness and Sampling 21
Simple Random Sampling 21
Stratification, Clustering, and Complex Sampling 23
Non-Random Sampling 26
Cross-Sectional and Time Series Sampling 27
Study Design: Experimentation, Observation, Surveying 27
Experimental Data—An Example 28
Observational Data—An Example 31
Survey Data—An Example 31
Loading Data into a Data Table 34
Entering Data from the Keyboard 34
Moving Data from Excel Files into a JMP Data Table 38
Application 39
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