Nothing
      print.summary.est.data.frame <- function(x,
                                         ...)
{
  if (x$type == "str"){ ## stratified
    
    cat("\n         Summary for effect estimation \n\n")
    cat("\n Treatment/exposure:", x$treat)
    cat("\n Outcome:", x$outcome)
    cat("\n Effect measure:", x$meas, "\n")
    cat("\n Effect estimates:\n\n")
    print(x$eff.tab)
    cat("\n Stratum-specific parameter estimates:\n\n")
    print(format(x$str))
    cat("\n Stratum-specific adjusted parameter estimates:\n")
    cat(x$adjust)
    cat("\n Stratum-specific weights:\n")
    cat(x$weights)
    cat("\n\n")
  }else{ ## matched
    
    cat("\n         Summary for effect estimation \n\n")
    cat("\n Treatment/exposure:", x$treat)
    cat("\n Outcome:", x$outcome)
    cat("\n Effect measure:", x$meas, "\n")
    
    cat("\n Effect estimates:\n\n")
    print(x$eff.tab)
    cat("\n\n")
  }
}
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