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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 l.jpg

Types of Graph

And when to use them!



Line graph3 l.jpg
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



Scatterplot5 l.jpg
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



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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



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Histogram

  • Used when discrete X is converted to categories (“bins”)

  • Y represents frequency of data within each “bin”



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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