A scatter plot matrix is exactly what it sounds like – a matrix of scatterplots.
This type of matrix is useful because it allows you to visualize the relationship between multiple variables in a dataset at once.
You can use the following basic syntax to create a scatter plot matrix in SAS:
proc sgscatter data=my_data; matrix var1 var2 var3; run;
This particular syntax creates a scatter plot matrix for the variables var1, var2, and var3 in the dataset called my_data.
The following example shows how to use this syntax in practice.
Example: Create Scatter Plot Matrix in SAS
Suppose we have the following dataset in SAS:
/*create dataset*/ data my_data; input team $ points assists rebounds; datalines; A 22 12 8 A 20 18 4 A 14 9 5 A 30 16 10 B 10 4 3 B 9 5 12 B 6 5 14 B 14 10 5 C 4 8 12 C 13 10 5 C 11 12 8 C 19 3 2 ; run; /*view dataset*/ proc print data=my_data;
We can use the following syntax to create a scatter plot to visualize the relationship between the points, assists, and rebounds variables:
/*create scatter plot matrix*/ proc sgscatter data=my_data; matrix points assists rebounds; run;
Note that we can also use the title function to add a title to the overall matrix and the group function to color the points in the plot based on the value for the team variable:
/*create scatter plot matrix with points colored by team*/ proc sgscatter data=my_data; title "Scatterplot Matrix"; matrix points assists rebounds / group=team; run; title;
The scatter plot matrix now has a title and the points in each scatter plot are colored based on their team value.
The following tutorials explain how to create other common charts in SAS: