Chapter 2.docx

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Statistical Sciences
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Augustin Vukov

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Chapter 2 The five W’s: WHO, WHAT, WHEN, WHERE, and (if possible) WHY…and HOW We must know at least the Who, What and Why to be able to say anything useful based on the data. The Who are the cases. The What are the variables. A variable gives information about each of the cases. The Why helps us decided which way to treat the variables. We treat variables in two different ways, as categorical or quantitative: Categorical (qualitative) variables identify a category for each case. Quantitative variables record measurements or amounts of something; they must have units. Sometimes we treat a variable as categorical or quantitative depending on how we want to learn from it. Terms: Data: systematically recorded information, whether numbers or labels, together with its co
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