Statistical graphics in APL: Structuring a graphical support system for interactive data analysis

The design of an interactive statistical graphics system in APL is described. Called STATGRAPHICS, the system is structured to create an environment in which statistical and graphics functions are integrated under flexible user control. An optional menu control scheme allows inexperienced users to execute functions under system control, while experienced users can access program functions directly. Procedure control functions, which generate fullscreen control pages and execute operations through defined program function keys, enable graphics to become an integral part of the statistical modeling process.