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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

Types of Graph

And when to use them!

line graph3
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
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 graph7
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
histogram9
Histogram
  • Used when discrete X is converted to categories (“bins”)
  • Y represents frequency of data within each “bin”
pie chart11
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
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