void deriveConfidenceValue(double baseCount){
  if (Utils.isMissingValue(m_confidence) && !Utils.isMissingValue(baseCount) && baseCount > 0) {
    m_confidence=m_recordCount / baseCount;
  }
}

void deriveConfidenceValue ( double baseCount ) { if ( Utils . isMissingValue ( m_confidence ) && ! Utils . isMissingValue ( baseCount ) && baseCount > 0 ) { m_confidence = m_recordCount / baseCount ; } }
backfit confidence value ( does nothing if the confidence value is already set ) .
