What is a scatterplot?
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What is a scatterplot?
- The first step of any statistical analysis is to first graphically plot the data. In terms of correlation, graphical plots are called scatterplots. Scatterplots can show you visually the strength of the relationship between the variables, the direction of the relationship between the variables, and whether outliers exist.
- Below is an example of a scatterplot between two variables - v1 and v2
What is the purpose of graphing the scatterplot?
- The purpose of graphing the scatterplot is to look at the relationship between the variables and determine if there are any problems/issues with the data or if the scatterplot indicates anything unique or interesting about the data, such as:
- How is the data dispersed?
- Are there outliers? A scatterplot is useful for “eyeballing” the presence of outliers. Just as a histogram is useful for “eyeballing” univariate outliers, the scatterplot is useful for “eyeballing” bivariate outliers.
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