- Always check what a number is compared with
- One data point rarely makes a trend
- First estimates are often revised later
1. Compared with what?
A change can be measured against the previous month or against the same month a year earlier. The two can tell very different stories. Year-on-year figures smooth out short-term swings, while month-on-month figures react faster but are noisier.
2. Was it expected?
News often reports whether a figure came in above or below expectations. A number can be high and still be described as good news if it was lower than economists had forecast. Knowing what was expected explains the tone of the coverage.
3. Is it adjusted for the season?
Many activities follow a yearly rhythm: shops hire before the holidays, construction slows in winter. Seasonally adjusted figures remove these regular patterns. Without the adjustment, a normal seasonal change can look like a dramatic event.
4. Is it a first estimate?
Statistics offices often publish an early estimate and update it as more information arrives. Revisions can be large enough to change the story. A figure that looked weak at first may later turn out to be stronger, or the other way round.
5. Is it one month or a trend?
A single surprising number can be caused by a one-off event such as a strike or a storm. A trend becomes visible only when several periods point in the same direction.
6. Where does it come from?
Check whether the figure comes from an official statistics office, a central bank, an international organisation or a private survey. Each source has its own method, and knowing it helps to judge how much weight the number deserves.
This article is general information for learning purposes. It is not professional advice.