Comparing indicators means setting two or more places side by side on the same measures and describing the differences with figures. You meet it in data-response questions that give a table and ask you to compare. It builds on using an indicator with its limitations.
All countries and figures here are invented.
How do you compare step by step?
- Use the same measure for both places. Do not compare income in one place with literacy in another.
- Quote both figures with units and year.
- Calculate the difference or ratio. Subtract for a gap, divide for “how many times”.
- Say who leads on each indicator. It may be different places for different measures.
- Comment on what the pattern suggests, and name a limit of the data.
Worked example
| Indicator (invented) | Country P | Country Q |
|---|---|---|
| GNI per person (US$) | 18,000 | 6,000 |
| Life expectancy at birth (years) | 70 | 76 |
| Adult literacy rate (%) | 96 | 97 |
GNI per person: 18,000 − 6,000 = 12,000, and 18,000 ÷ 6,000 = 3. Country P’s figure is US$12,000 higher, three times as large.
Life expectancy: 76 − 70 = 6. Country Q’s figure is 6 years higher.
Literacy: 97 − 96 = 1. The two are close, with Country Q one percentage point higher.
Written comparison: “Country P has a higher GNI per person, at US$18,000 compared with US$6,000, three times as much. Country Q has the higher life expectancy, 76 years compared with 70, and a similar literacy rate. So neither leads on every measure. The data do not show how income is shared in either country, so the comparison has limits.”
What mistake should you watch for?
Mistaken answer: “Country Q is less developed and its people are worth less because its income is lower.”
This makes two errors. It treats one indicator as the whole of development, and it moves from a statistic about income to a judgement about the value of people.
The correction is to describe the measure: “Country Q has a lower income per person than Country P, but a longer life expectancy.” Indicators describe conditions in a place. They do not say anything about the worth of the people living there.
Check yourself
All data are invented.
1. Country R has a GNI per person of US$4,500 and Country P has US$18,000. How many times larger is Country P’s figure?
Show answer
18,000 ÷ 4,500 = 4. Country P’s figure is four times as large. Check: 4,500 × 4 = 18,000.
2. Country R has a life expectancy of 66 years and Country Q has 76. Write one comparison sentence.
Show answer
“Country Q has a life expectancy of 76 years, which is 10 years longer than Country R’s 66 years.”
3. Why is it not enough to use GNI per person alone?
Show answer
It measures income only. It does not show health, education or how income is shared, so a second indicator such as life expectancy gives a fuller picture.
Where does this lead next?
Next, learn how to explain why differences arise in explaining a mechanism linking access and outcomes. The statistics and distribution explorer can help you practise reading differences and ratios. For help turning comparisons into precise written answers, see online one-to-one Geography tuition.