Catalyse Pulse · US and 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
USThe store with the lowest grocery prices by gender
| All | Men | Women* | |
|---|---|---|---|
| Walmart | 49% | 54% | 41% |
| Aldi | 18% | 13% | 26% |
| Dollar General | 9% | 11% | 5% |
| Kroger | 7% | 6% | 8% |
| Amazon / Whole Foods | 4% | 5% | 3% |
| Costco | 4% | 5% | 3% |
* 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 US poll is matched to US Census figures for age, gender, region, race and ethnicity, and education; political questions are also matched to how people voted in the 2024 presidential election.
A weighted UK 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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