Statistical Sciences 1023A/B Chapter Notes - Chapter 9: Pie Chart, Categorical Variable, Line Graph
Document Summary
The best way to present categorical data is either as a bar graph or pie chart. A bar graph gives a visual display of the relative sizes of each category. A pie chart gives a visual display of what fraction or percentage of the whole each category accounts for. Plots, graphs, and pictures pie chart bar graph. Pie charts: useful when only one categorical variable is measured (i. e. eye colour, program, show what percentage of the whole falls into each category. Pictograms: like a bar graph, except with image, need to look only at the height, and not be misled by the area of each image. Line graphs: patterns depicted in a line graph are much wasier to detect than if they were simply displayed as a large array of numbers. Scatterplots: useful for displaying the relationship between two measurement variables, shows outliers, as well as the degree of variability.