What is the PROC GPLOT primarily used for?

PROC GPLOT is primarily used for generating scatter plots and line graphs in SAS. This procedure allows users to visualize relationships between two numeric variables, making it invaluable for exploratory data analysis and understanding data trends. Through the use of GPLOT, you can specify various options to customize the appearance of the plot, including point types, line styles, and colors.

This procedure is particularly useful in statistical analysis where relationship visualization is required, such as understanding correlations or trends over time. It supports the creation of complex graphs that can illustrate data distributions and comparisons effectively.

Other options center around different types of visualizations or statistical calculations. For instance, pie charts, bar charts, and summary statistics are handled by different procedures like PROC GCHART or PROC MEANS, which are not recognized for their capabilities to produce scatter plots or line graphs. Thus, PROC GPLOT is distinctly positioned for the task described in the correct answer, focusing on the graphical representation of data through scatter plots and line graphs specifically.