The following graphics allow to add a weight variable:
A weight variable may been selected using the graphic menu, by pressing ALT-W
or by dragging a continuous or ordinal variable into the graphic itself.. If a
variable is selected in the toolbar
any plot that is opened will have this weight variable per default.
Weight variables are a very important aspect in networks, as they give the size of flows (e.g. number of cars, trade values,...). In Flow Diagrams they specify the size of the flow representations.
The following dialog pops up:
If no continuous weight variable is selected, no weight variable will be added to the graphic.