dagR (version 1.1.1)

dag.ancestors: Identify ancestors of DAG nodes.

Description

This identifies those nodes in a DAG that are ancestors of the nodes specified, i.e. acc. to the model depicted by the DAG they causally precede those nodes. Internally called by dag.adjustment in the context of finding associations introduced by adjustment.

Usage

dag.ancestors(dag, A)

Arguments

dag

The DAG to be evaluated.

A

A vector of nodes for which ancestors are to be identified.

Value

• A vector indicating which nodes are ancestors of those in A. Note that A actually is included at the beginning of the vector.

See Also

dag.adjust, dag.adjustment

Examples

dag6<-demo.dag6();
dag.draw(dag6);
dag.ancestors(dag6,4);
dag.ancestors(dag6,3);
dag.ancestors(dag6,2);
dag.ancestors(dag6,1);
dag.ancestors(dag6,7);