pamstat - Chapter 1.1- Displaying Distributions with Graphs...

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Chapter 1.1- Displaying Distributions with Graphs statistics - the science of learning from data Chapter 1- descriptive statistics Chapter 1.1- describe data set graphically Chapter 1.2- describe data set numerically cases - objects described by set of data (individuals, companies, states…) variable - any characteristic of a case distribution - tells us what values a variable takes and how often it takes those values categorical variable - places a case into one of several groups or categories (gender, race, ethnicity…) quantitative variable - takes numerical values for which arithmetic operations (adding, averaging…) make sense (test scores, income…) Bar Graphs •use for categorical variables •plot count or percent on vertical axis versus categories on horizontal axis •can also plot mean or median against different categories •include spaces between bars to distinguish between different categories Histograms •use for quantitative variables •divide the data into classes of equal width and record count in each class
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pamstat - Chapter 1.1- Displaying Distributions with Graphs...

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