Amos provides many operations for drawing path diagrams and for improving their looks. For example, you can
•Draw an ellipse to represent an unobserved variable
•Move the ellipse from one place to another
•Make an ellipse bigger or smaller, or change its shape.
These are only three examples of drawing and modeling operations; there are about eighty others. Amos provides four different ways to pick the operation you want to perform:
•Using the mouse to press a button in a toolbox
•Using the mouse or the keyboard to select an item from a menu
•Pressing a shortcut key on the keyboard (for some operations)
•Using the second mouse button to select an item from a pop-up menu (for some operations).
These four methods of selecting an operation are described in the following sections.