Numerical data is what makes content a citable source. Phrases like significant savings, fast delivery or a favourable price are not information, cannot be verified or compared, and therefore do not make it into answers. A specific figure, by contrast, does. Several rules apply when working with numbers. Always state the unit and the currency, both bounds for ranges, and the condition in the same sentence for conditional values. State which period the figure relates to, since without a date it becomes unusable the moment it changes. If a figure comes from an external source, cite it; if it comes from your own data, state the methodology. And avoid figures you cannot defend – an inaccurate figure spreads through answers and is difficult to correct.
See also: Original data as a citation magnet, Table as a citable format, Time validity of data.
