In the CAUSALGRAPH procedure, edges in a causal model are specified in the MODEL statement as either right, left, or bidirected arrows. In addition, the treatment and outcome variables are separated by a right arrow in the IDENTIFY statement.
The following table summarizes the edges and the syntax that you can specify in PROC CAUSALGRAPH:
| Edge Type | Syntax | Statements |
|---|---|---|
| Right arrow | >, ->, –>, —>, =>, ==>, ===> |
MODEL, IDENTIFY |
| Left arrow | <, <-, <–, <—, <=, <==, <=== |
MODEL |
| Bidirected arrow | <>, <->, <–>, <—>, <=>, <==>, <===> |
MODEL |