class NumberColumn extends AbstractColumn<C, T> implements NumericColumn<T> {

  @Override
  public int countMissing() {
    int count = 0;
    for (int i = 0; i < size(); i++) {
      if (isMissing(i)) {
        count++;
      }
    }
    return count;
  }

  protected  NumberColumn(final ColumnType type, final String name);

}