STAB22H3 Study Guide - Midterm Guide: Time Series, Standard Deviation, Linear Map
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STAB22H3 Full Course Notes
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Document Summary
Data are numbers with a context, and we need to understand the context if we are to make sense of the numbers. Individuals: are the objects described in a set of data. When the objects that we want to study are not people, we often call them cases. Cases: when the objects that we want to study are not people, we often call them cases. A variable can take different values for different individuals. Categorical variable: place an individual into one of two or more groups or categories. Quantitative variable: takes numerical values for which arithmetic operations, such as adding and averaging, make sense. Distribution: the distribution of a variable tells us what values it takes and how often it takes these values. Rate: often, the rate at which something occurs is more meaningful than the simple count of occurrences. To find the mean of a set of observations, add their values and divide by the number of observations.
