Catalyse Pulse · UK
Sample sizes & weighting
Why the number of people we ask matters, how weighting works, and how to read small groups.
4 short chapters
How small groups look on a poll page
The supermarket with the best value for money by household income
| All | Under £25k | £25k-£49k* | £50k or more | |
|---|---|---|---|---|
| Tesco | 31% | – | 14% | 49% |
| Aldi | 26% | – | 40% | 14% |
| Sainsbury's | 11% | – | 3% | 18% |
| Lidl | 10% | – | 17% | 6% |
| Asda | 8% | – | 14% | 2% |
* under 50 people, read as a rough guide– under 30, not shown
How precise a result is
The more people we ask, the more precise the result. Groups inside a poll, such as one age band, are smaller than the whole poll, so their results are less precise: we mark small groups and do not show the smallest.
Weighting
Each poll page says whether its results are weighted. A weighted poll is matched to ONS figures for age, gender, region, social grade and education; political questions are also matched to how people voted in the 2024 general election and the 2016 EU referendum.
Small groups
Groups under 50 people are marked * and should be read as a rough guide. Groups under 30 people are not shown at all.
Reading a difference
A gap of a few points between two groups can be down to chance. Look for bigger gaps, in bigger groups, before reading much into them.
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