Search Algorithms: WGFCI |
WFGES ("Whimsical Fast Greedy Equivalence Search") is an experimental algorithm for the mixed variable case. Each discrete variable is rewritten as a set of indicator variables, and then FGES (see) is run over the indicators and continuous variables. A causal connection is inferred between X and Y if X and Y are connected and continuous, or if there is a connection between one of the indicators of the X or of Y to an indicator of the other, or to a continuous variable, if X or Y is continuous. Unanimous directions are inferred.
Note: Zhang (2006) supplies an orientation rule set for FCI that is both arrow-complete and tail-complete; this is not currently implemented.