The TETRAD Project:
DSEP Tutor
We have a couple of versions of a tutor for learning how D Separation works. These pages link to pages that have Java applets in them, which will assume that you've got a reasonable version of Java installed. See sun.java.com.
Versions "A" and "B" are the same applet that differ only in the problem sets that are loaded. This applet is due to Willie Wheeler.
scheines@andrew.cmu.edu