Types of Graph

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Types of Graph - PowerPoint PPT Presentation

Types of Graph. And when to use them!. Line Graph. Line Graph. Used to show trends Variable plotted on X (bottom) musts be continuous Common type is “time series” where X = time CANNOT be used to graph data where X is discrete. Scatterplot. Scatterplot.

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Types of Graph

And when to use them!

Line Graph
• Used to show trends
• Variable plotted on X (bottom) musts be continuous
• Common type is “time series” where X = time
• CANNOT be used to graph data where X is discrete
Scatterplot
• Used to show relationships between variables
• X variable must be continuous
• If one variable is believed to cause or explain changes in the other, that variable is plotted on the X
Bar Graph
• Used to compare amounts or frequencies in data that represents different categories (discrete data sets)
• Categorical data set is plotted on X, quantitative (continuous) on the Y
• Often used incorrectly to graph data with continuous X variables
Histogram
• Used when discrete X is converted to categories (“bins”)
• Y represents frequency of data within each “bin”
Pie Chart
• Used for same kind of data as bar chart
• Each slice = data category
• Slice size shows relative proportion of observations within each category