coef.WCE <- function(object, ...){ # obtains coefficients from WCE object
  if  (is.null(object$covariates) == T) {
    ret <- list(covariates = NULL, WCEest = .nicer(object$est))} 
  else {
    ret <- list(WCEest = .nicer(object$est), covariates = object$beta.hat.covariates)}
  ret
}