Draws unobserved variables (ellipses).
Syntax
variable = pd.DiagramDrawUnobserved (x, y, width, height)
The DiagramDrawUnobserved method syntax has the following parts:
| Part | Description | 
| variable | The newly drawn unobserved variable (ellipse). (An object of type PDElement.) | 
| x | Horizontal coordinate of the center of the ellipse, expressed in inches from the left margin. | 
| y | Vertical coordinate of the center of the ellipse, expressed in inches from the top margin. | 
| width | Width of the ellipse, in inches. | 
| height | Height of the ellipse, in inches | 
Calling DiagramDrawUnobserved with no arguments is equivalent to the menu selection Diagram → Draw Unobserved.