ggm: isADMG – R documentation

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Documentation

ggm

isADMG

Acyclic directed mixed graphs

Description

Check if it is an adjacency matrix of an ADMG

Usage

isADMG(amat)

Arguments

amat

Details

Checks if the following conditions must hold: (i) no undirected edge meets an arrowhead; (ii) no directed cycles;

Value

A logical value, TRUE if it is an ancestral graph and FALSE otherwise.

Author(s)

Giovanni M. Marchetti, Mathias Drton

References

Richardson, T. S. and Spirtes, P. (2002). Ancestral Graph Markov Models. Annals of Statistics, 30(4), 962–1030.

Examples

## Examples from Richardson and Spirtes (2002)
	a1 <- makeMG(dg=DAG(a~b, b~d, d~c), bg=UG(~a*c))  
	isADMG(a1)    # Not an AG. (a2) p.969    
	a2 <- makeMG(dg=DAG(b ~ a, d~c), bg=UG(~a*c+c*b+b*d))           # Fig. 3 (b1) p.969  
	isADMG(a2)

ggm

Graphical Markov Models with Mixed Graphs

v2.5

GPL-2

Authors

Giovanni M. Marchetti, Mathias Drton, Kayvan Sadeghi

Initial release

2020-02-014