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lecture_1_1

# lecture_1_1 - Looking at data distributions Displaying...

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Looking at data: distributions Displaying distributions with graphs IPS chapter 1.1

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Objectives (IPS chapter 1.1) Displaying distributions with graphs Variables Two types of variables Ways to chart categorical data Bar graphs Pie charts Ways to chart quantitative data Stemplots Histograms Time Plots Interpreting histograms
Variables In a study, we collect information—data—from individuals . Individuals can be people, animals, plants, or any object of interest. A variable is a characteristic that varies among individuals in a population or in a sample (a subset of a population). Example: age, height, blood pressure, ethnicity, leaf length, first language The distribution of a variable tells us what values the variable takes and how often it takes these values.

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Two types of variables Variables can be either quantitative… Something that can be counted or measured for each individual and then added, subtracted, averaged, etc. across individuals in the population. Example: How tall you are, your age, your blood cholesterol level, the number of credit cards you own … or categorical. Something that falls into one of several categories. What can be counted is the count or proportion of individuals in each category. Example: Your blood type (A, B, AB, O), your hair color, your ethnicity, whether you paid income tax last tax year or not
How do you know if a variable is categorical or quantitative?

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• Fall '08
• ABDUS,S.

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