NovA number without its denominator can overstate the conclusion
How to edit percentages, averages and market figures so that the base, period and definition remain visible instead of letting a precise number imply more than the data supports.
This article reflects the named expert’s practical perspective. See NovAsia’s editorial policy for how material is prepared and reviewed.
Numbers feel precise even when half their meaning is missing. “Seventy per cent of buyers choose…”, “revenue rose by 30%”, “80% of the units have been sold” — each sentence arrives with the confidence of arithmetic. My first editorial question is deliberately less impressive: seventy per cent of what, thirty per cent compared with what, and eighty per cent of which defined set?
That is not mathematical fussiness. The base changes the conclusion. Seven responses out of ten and seven hundred out of a thousand both produce 70%. They do not give the reader the same evidence. Ten sales from twelve units released in one phase and 80% of every unit in the development are also different claims, even when the percentage looks similar.
The denominator tells us what was actually measured
Consider a hypothetical listing sample. A portal shows 40 advertisements from one development, and 12 carry a label suggesting a particular ownership category. Writing “30% of the development is available in that category” would hide several assumptions. It assumes the 40 ads represent the full development, that they are unique units, that the label is correct for each unit and that the sample belongs to one consistent date.
If all we truly know is that 12 of 40 visible listings carry the label, the sentence should stay close to that evidence. The percentage can still be useful. It simply describes the observed sample rather than the entire building.
Averages create the same editorial problem in a different form. “The average asking price increased” may reflect a market movement, or it may reflect a change in the mix of listings. A month containing more large, high-floor or newly launched properties can lift the average even if like-for-like asking prices did not move. Here the hidden denominator includes not only the number of observations but the definition of which observations count.
The right question is therefore not just “is the calculation correct?” A calculation can be flawless while the sentence built around it is too strong. The better question is “what conclusion does this calculation actually justify?”
Period and definition are part of the denominator
Percent changes also need a stable definition over time. Suppose enquiries are reported as 25% higher this month. If last month counted only completed website forms and this month also includes messenger contacts, the percentage no longer measures the same thing. A change in the counting rule can masquerade as a change in demand.
Small bases can make correct percentages sound dramatic
Small bases deserve special care. Two completed transactions becoming three is a 50% increase. The arithmetic is correct, yet the phrase “transactions rose 50%” can create a sense of broad momentum that three observations cannot support. Showing the absolute numbers beside the percentage often restores scale immediately.
Missing observations are part of the story
I also look at who or what has been excluded. A survey of people who already requested a property shortlist cannot automatically describe every site visitor. A rental return calculated only for occupied months is not an annual return unless vacancy is dealt with. An average based on advertised prices is not automatically evidence of achieved transaction prices.
A useful number keeps four things close
For most readers, the solution does not require a statistics lecture. Four pieces of context are usually enough: the base, the period, the definition and the source. Sometimes one sentence can carry them. Sometimes a chart caption is the right place. Sometimes the cleanest editorial choice is to use absolute numbers instead of a percentage.
If a figure is an estimate, the word “estimate” should survive the headline, summary and conclusion. If it describes a sample, the sample should not silently become “the market”. If two sources define the same metric differently, combining them into one trend line may be more misleading than leaving a gap.
The problem with a missing denominator is not that readers cannot do maths. It is that a tidy number can conceal editorial choices so effectively that the reader never sees there was a choice. Our job is to put the base back into view. Then 70% remains 70%, but it stops pretending to describe more of the world than the data actually measured.
Sources
- NovAsia — Economy and Finance pages, examples of dated indicators, defined periods, named sources and explicit limits on market estimates; checked 6 October 2026.
- NovAsia — Ekaterina Andreeva expert profile, editorial principles for sources, assumptions and strength of claims; checked 6 October 2026.