EA                      Ersan and Alici (2016) Cluster analysis with
                        the altered steps.
EHO                     Likelihood factorization of Easley et. al.
                        (2010) - EHO Factorization
GAN                     GAN et al.(2015) Clustering based PIN Estimates
InfoTrad-package        Calculates the Probability of Informed Trading
                        (PIN)
LK                      Likelihood factorization of Lin and Ke (2011) -
                        LK Factorization
YZ                      Yan and Zhang (2012) Grid-Search based PIN
                        Estimates
