Before revision:  However, there has been limited success in moving beyond maximum-likelihood estimation and deriving estimates for the  posterior distribution of regression coefficients  , due to a need for computationally expensive Gibbs sampling approaches to evaluate analytically intractable partition function integrals.
After revision:  However, there has been limited success in moving beyond maximum-likelihood estimation and deriving estimates for the posterior distribution of regression coefficients , due to a need to evaluate analytically intractable partition function integrals.