graphID.htcID: Determines if a mixed graph is HTC-identifiable.

In SEMID: Identifiability of Linear Structural Equation Models

Determines if a mixed graph is HTC-identifiable.

Description

Uses the half-trek criterion of Foygel, Draisma, and Drton (2013) to check if an input mixed graph is generically identifiable.

Usage

graphID.htcID(L, O)

Arguments

L	Adjacency matrix for the directed part of the path diagram/mixed graph; an edge pointing from i to j is encoded as L[i,j]=1 and the lack of an edge between i and j is encoded as L[i,j]=0. There should be no directed self loops, i.e. no i such that L[i,i]=1.
O	Adjacency matrix for the bidirected part of the path diagram/mixed graph. Edges are encoded as for the L parameter. Again there should be no self loops. Also this matrix will be coerced to be symmetric so it is only necessary to specify an edge once, i.e. if O[i,j]=1 you may, but are not required to, also have O[j,i]=1.

Value

The vector of HTC-identifiable nodes.

References

Foygel, R., Draisma, J., and Drton, M. (2012) Half-trek criterion for generic identifiability of linear structural equation models. Ann. Statist. 40(3): 1682-1713.

SEMID documentation built on July 26, 2023, 5:40 p.m.