condeptree              This is the function that computes the
                        skeletion tree from data. The input is a matrix
                        x whose rows are the data vectors. The sample
                        size n is the number of rows. The number of
                        variables p is the number of columns The
                        function outputs the skeleton tree g.
outgoing                Creates an outgoing tree from a given
                        undirected treee.
polytree                Causal Polytree Estimation
xicorln                 This function computes the xi correlation
                        coefficient.
