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The purpose of this article is to explain QQ Plot

What is QQ Plot in the Data Science Toolkit?

Purpose:  

The purpose of the QQ plot is to test for normal distribution in a column of data.  Many predictive models require that the data be normally distributed.  If it is not, then the model will not work well.  This plot can help a user determine if their data is normally distributed and whether or not it should be fed into a given predictive model.

Output: 

• Single scatter plot visualization 
• Cross table for p90,p10,p10/p90, mean, median, Swanson's mean.
• Normal Quantiles are on the x-axis and the sample Quantiles are on the y-axis

Example:

Data Science Toolkit QQ Plot User Guide: How to set up QQ plot

See RAI QQ Plot video below

Data Science Toolkit - QQ Plot from Ruths.ai on Vimeo.

For additional information on RAI Data Science Toolkit documentation, click here.