Set up demo DAG #7.
Initializes a DAG motivated by the manual for the software DAG v0.11 (Kn\"uppel 2009). This DAG has been featured in Breitling (2010). The DAG is the same as DAG #3, but #7 demonstrates the use of alternative node symbols.
demo.dag7()
Returns a DAG.
Lutz P Breitling <l.breitling@posteo.de>
Breitling LP (2010). dagR: a suite of R functions for directed acyclic graphs. Epidemiology 21(4):586-587.
Kn\"uppel S (2009). DAG v0.11 documentation (Oct 21, 2009). https://hsz.dife.de/dag/
demo.dag3
dag7<-demo.dag7(); summary_dagRdag(dag7); dag.draw(dag7, legend=FALSE); dag.draw(dag7, alt.symb=FALSE);
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