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

Description Usage Arguments Value References


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





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.


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.


The vector of HTC-identifiable nodes.


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.

Lucaweihs/SEMID documentation built on June 3, 2019, 2:13 a.m.