Scatter Plot

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Scatter PlotImage: Yale: Scatterplot

A scatter plot identifies a possible relationship between changes observed in two different sets of variables. By presenting the data in a clear manner, it provides a visual and statistical means to test the strength of a relationship between two variables.

Scatter plots can be effective in measuring the strength of relationships uncovered with a fishbone diagram.

A very basic description of scatter plots follows; for more detailed help on construction and interpretation, consult the NIST/SEMATECH e-Handbook of Statistical Methods [Attn: Non-MDH link].

How to Create a Scatter Plot


Creating a Scatter Plot

  1. Collect at least 50-100 paired samples of data that you think might be related, and build a data spreadsheet
  2. Draw the horizontal and vertical axes of the diagram
  3. Plot the data points on the diagram (if you have created your spreadsheet in MS Excel, you can use the program to build a scatter plot with your data)

Interpreting a Scatter Plot

Many levels of analysis can be applied to the diagram. You might find it helpful to consult a statistical process control guide or other texts for assistance with analysis, in order to ensure you're correctly identifying a positive or negative correlation (or absence thereof).

It's important to note that scatter plots show correlation between two variables, from which causation may or may not be inferred.

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Further Reading


More Information

Examples of Scatter Plots

Source

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