@Override
  public ExampleSetMetaData applyOnFilteredMetaData(ExampleSetMetaData metaData) {
    for (AttributeMetaData amd : metaData.getAllAttributes()) {
      if (amd.isNumerical() && !amd.isSpecial()) {
        Range range = amd.getValueRange();
        amd.setValueRange(
            new Range(0, Math.max(Math.abs(range.getLower()), Math.abs(range.getUpper()))),
            amd.getValueSetRelation());
        amd.getMean().setUnkown();
      }
    }

    return metaData;
  }