Week 2: Pre-Class Primer

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Last updated 4:15 PM on 9/17/26
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13 Terms

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Categorical Variables

qualitative distinctions, numerical values are labels

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Quantitative Variables

numerical measurements

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Nominal Variables

variables that represent categories, no ranking

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Ordinal Variables

variables with meaningful order

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Discrete Variables

countable whole values

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Continuous Variable

can take on any value within a range

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Provenance

source of data

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Measures of Central Tendency

mean, median, mode

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Measures of Spread

standard deviation, IQR

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Frequency Distribution

count of how many observations fall into each category

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Cross-Tabulation

joint distribution of two or more categorical variables

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How to Visualize Quantitative Variables

  • histogram: distribution of single variable

  • boxplot

  • scatter plots


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How to Visualize Categorical Variables

  • bar charts