홈 → Scientific Software International
in 10 easy steps
This example shows how a conceptual path diagram, in other words, just the visual representation of a model, can be produced in LISREL and saved as a GIF file to be used on the Web, as email attachment, etc. It works also with the student edition of LISREL (available as a free download on this website). No data are needed, we just use the features of the Interactive LISREL user interface.
1. From the File drop-down menu select the New option and choose Path Diagram, as shown:
2. Click OK, and type a filename in the
File Save As dialog box, for example, example.pth:
3. When the Path Diagram window shows up, make sure that
the Variables option, as well as the Tool Bar, Status Bar, Type
Bar, and Drawing Bar options on the Toolbars submenu are checked.
4. Now, select the Variables option from the Setup dropdown menu.
5.This results in the Labels dialog box, where we type the names of the Observed Variables and the Latent Variables that we want to use. In the first picture below, we are about to add 6 observed variables to the default two (VAR 1 and VAR 2 ) in the dialog box that popped up when we clicked on Add/Read Variables. In the next picture, where we can see the result of adding the six observed variables, we are adding five latent variables, using the convenient list notation L1-L5, resulting in the latent variables L1, L2, L3, L4, and L5. Don't worry about the right names, we can always change them later.
Select Conceptual Diagram from the rightmost dropdown list box on the Type Bar (as seen below).
Now, we drag all the variables we want in the path diagram from the list of variables, one
at a time, to the empty drawing area. Click on a variable name, hold the mouse button down and drag the variable
within the drawing area of the path diagram window, then release the mouse button. Below we are about done, the
mouse cursor is dragging the last variable, VAR 8, to the desired spot. The locations can always be changed
later, as well as most anything else.
Change the shape of the objects, the locations, the colors, etc. as you wish. The new manual,
Interactive LISREL: User's Guide, and LISREL's online help have numerous illustrations on how to do this.
8. We may uncheck the Variables option from
the Toolbars submenu to create more room for the drawing area. Switch to the One-way Path button
on the Drawing Bar (upper right, as shown below) and draw the paths between the variables: click
on the "from" variable (it should change color), hold down the mouse button and drag it to within the
area of the "to" variable until that one changes color, then release. Below, the path from the latent
independent variable L2 to the latent dependent variable L5 is being drawn. The "to" variable
has changed color, so we may release the mouse button and the path is drawn.
A message box lets us know that conversion was successful and gives the exact name and location of the file. That's it, all done. Note that conversion may take up to 10 seconds on a slow system.