public final double rootMeanPriorSquaredError(){
  if (m_NoPriors) {
    return Double.NaN;
  }
  return Math.sqrt(m_SumPriorSqrErr / m_WithClass);
}

public final double rootMeanPriorSquaredError ( ) { if ( m_NoPriors ) { return Double . NaN ; } return Math . sqrt ( m_SumPriorSqrErr / m_WithClass ) ; }
returns the root mean prior squared error .
