@Override public String metricString(){
switch (m_metricType) {
case LIFT:
    return "lif";
case LEVERAGE:
  return "leverage";
case CONVICTION:
return "conviction";
default :
return "conf";
}
}

@ Override public String metricString ( ) { switch ( m_metricType ) { case LIFT : return "lif" ; case LEVERAGE : return "leverage" ; case CONVICTION : return "conviction" ; default : return "conf" ; } }
returns the metric string for the chosen metric type
