BMGT 230 Chapter Notes - Chapter 4: Bar Chart, Pie Chart, Contingency Table
2 Mar 2015
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The three rules of data analysis: make a picture. A well-designed display will do much of the work of analyzing your data. It can show the important features and patterns. A picture will also reveal things you did not expect to see: extraordinary (possibly wrong) data values or unexpected patterns. The best way to report to others what you find in your data is with a well- chosen picture. Each category has a number of occurrences (frequency tables) Frequency table- records the counts for each of the categories of the variable and lists the counts under the category name. Relative frequency table- a table that lists the categories in a categorical variable and gives the number (the percentage) of observations for each category. 4. 2 displaying a categorical variable (visualize categorical data) The area principle- in a statistical display, each data value is represented by the same amount of aera.
