Across 174 countries, Corruption Perceptions Index and Fixed broadband rise and fall together at r = +0.70 (on a scale from −1 to +1, where 0 means no link). Comparing only countries with similar income (GDP per person) shrinks it to +0.30 (q = 0.042, allowing for the many pairs tested). Much of the first figure is that both measures rise with national income, but a weak positive link remains.
Comparing countries across the middle half of corruption perceptions index, 30 to 57 points, fixed broadband is better by 15.6 per 100 people at the top of that range than the bottom. Comparing only countries with similar national income, the gap is 5.27 per 100 people.
Link before adjusting (r)+0.701p = 5.0e-27 · 174 countries
After adjusting for national income+0.298p = 6.7e-5 · likely range [+0.16, +0.43]
p, allowing for regions0.004standard error 0.065 · 7 regions
Check for luck (q)0.042across 12,497 pairs
How to read these.r runs from −1 (one goes up as the other goes down) to +1 (they rise together), and 0 means no link. Adjusting for national income means comparing countries with the same GDP per person, so differences in wealth can’t explain the link. Income is used in percentage terms, since an extra $1,000 means more to a poor country than to a rich one. p is how likely a link this strong would be if there were really none. Below 0.05 means it is unlikely to be chance. Very small values are written in short form: 1.1e-32 means a decimal point followed by 31 zeros and then 11, so very close to zero. The likely range is where the true figure probably lies, and a range that crosses zero means the link could easily be chance. Countries in the same region tend to resemble each other, so the third figure allows for that, which gives a fairer p. The standard error is the typical size of the error in r. Finally, testing this many pairs means some will look strong by luck alone. A q below 0.05 means this link is unlikely to be one of those.
Corruption Perceptions Index · index (0-100, higher = cleaner)link with income +0.72 · high
Fixed broadband · per 100 peoplelink with income +0.88 · proxy
Both of these rise and fall closely with national income, so a strong link between them before adjusting was close to certain. Read the adjusted figure, not the first one.
“Link with income” is how closely each measure tracks GDP per person across countries, from −1 to +1.
Every country as a dot
best-fit line line after adjusting
Four ways to measure the link
Method
r
p
Countries
Standard (Pearson), not adjusted
+0.701
5.0e-27
174
By rank (Spearman), not adjusted
+0.677
1.2e-24
174
Standard (Pearson), adjusted for national income
+0.298
6.7e-5
174
By rank (Spearman), adjusted for national income
+0.121
0.114
174
The rank version uses only each country’s place in line, from lowest to highest, so a few extreme countries count for less. The adjusted and unadjusted versions use the same 174 countries: those that report both measures and GDP per person. So the gap between them comes from the adjustment, not from a change in which countries are counted. Drop in the size of r after adjusting: +0.402 (a minus sign means it grew).
How solid is it?
Leaving out one country at a time, r ranges from +0.279 (without GUY) to +0.326 (without BTN). The bar above shows that range on a scale from −1 to +1, with the solid line at the full result. The single country that moves r most: BTN (+0.028).
Within each region
Countries are not separate, unrelated cases, and neighbors share a lot. A link that holds inside each region is far more believable than one that shows up only when comparing regions.
n
r
East Asia & Pacific
22
+0.20
Europe & Central Asia
48
+0.30
Latin America & Caribbean
29
+0.68
Middle East, North Africa, Afghanistan & Pakistan
21
+0.19
Sub-Saharan Africa
46
+0.39
By income third
If the link shows up only in the richest third of countries, it is a feature of rich countries, not a general pattern.
n
r
Poorest third
58
-0.26
Middle third
58
+0.17
Richest third
58
+0.45
By largest religious group
Countries grouped by a label they share, such as main religion, rather than by a number. Groups of fewer than twelve countries are not shown. These groups differ in income, region and history all at once. So a gap between them is a place to start asking questions, not an answer.
n
r
Christians
104
+0.32
Muslims
48
+0.07
By last european coloniser
Countries grouped by a label they share, such as main religion, rather than by a number. Groups of fewer than twelve countries are not shown. These groups differ in income, region and history all at once. So a gap between them is a place to start asking questions, not an answer.
n
r
France
25
+0.12
Never a European colony
21
+0.46
Spain
19
+0.60
United Kingdom
55
+0.42
Without outliers (countries far outside the middle half of countries on either measure, by more than one and a half times the width of that middle half): r = +0.298 after dropping 0 countries.
Two series, one country
Both measures over the years for one country you pick. The two charts are stacked so they share only the years along the bottom.
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Over time, within countries
Everything above compares countries with each other at one moment. This section compares each country only with itself over 13years. So a link here can’t come from anything about a country that stays the same, such as its history, geography, institutions or culture.
Within countries over time, there is no link that is clearly more than chance (r = +0.144, comparing each country only with itself over the years, and each year only with the same year elsewhere). Whatever the cross-country picture shows, countries whose corruption perceptions index moved did not tend to see their fixed broadband move with it.
Across countries (adjusted)+0.298for comparison
Within countries+0.100each country vs itself
…and vs the same year elsewhere+0.144q = 0.135 · 176 countries
Year-on-year changes+0.056q = 0.199
Read with care.
Almost all of this indicator's variation is between countries, not within them, so the within-country estimate rests on a small part of the data.
2,156 country-years (one country in one year), 176 countries, 2012–2024, about 12 years each on average. Share of the variation that happens within countries over time: 2% for Corruption Perceptions Index, 6% for Fixed broadband. The margins of error allow for each country appearing many times, and for each year’s value being close to the year before.
Year-to-year changes are a cautious test, not a final answer. Looking only at changes from one year to the next removes each country’s own trends. But it also makes measurement mistakes louder, which pulls the results toward zero. A near-zero result here is weak evidence of no link, not proof.
With one measure years behind the other
Same year (lag 0): +0.144. A peak away from zero does not show which comes first. These series change slowly — this year’s value is close to last year’s. That makes the curve smooth and nearly symmetric, whatever produced the data. Even a sharp peak at one lag (a gap of some years) would not prove that one measure changes the other.
The data
index (0-100, higher = cleaner)
per 100 people
Years
Denmark DNK
90
43.4
2024
Finland FIN
88
36.5
2024
Singapore SGP
84
27.8
2024
New Zealand NZL
83
38
2024
Norway NOR
81
45.2
2024
Luxembourg LUX
81
40.3
2024
Switzerland CHE
81
47
2024
Sweden SWE
80
40.6
2024
Netherlands NLD
78
43
2024
Iceland ISL
77
37.5
2024
Ireland IRL
77
32.3
2024
Australia AUS
77
36.5
2024
Uruguay URY
76
33
2024
Estonia EST
76
35.4
2024
Germany DEU
75
45.6
2024
Transparency International, Corruption Perceptions Index World Bank, World Development Indicators One of these measures is published under a licence that forbids changes. Values are shown exactly as published and must not be republished in a changed or rescaled form.
Transparency International · via Our World in Data · CC BY-ND 4.0 · updated annual · comparable from 2012 only
Measures how corrupt the public sector is believed to be, based on 13 surveys of experts and business people. Some of the same surveys feed the Worldwide Governance Indicators' Control of Corruption measure, so the two share ingredients.
International Telecommunication Union · CC BY 4.0 · updated quarterly
Subscriptions, not people. A household line counts once, however many people use it. A country that went straight to mobile data can be well connected with few of these lines. Internet users, already on the site, is the measure of people.
How this was computed
Data used: most recent value in 2010-2025; values come from 2014–2024. To adjust for income, each measure is first predicted from GDP per person (in percentage terms, on a log scale) with a straight-line fit. Only what is left over is then compared. This is called a partial correlation. The line is drawn the standard way (ordinary least squares), which picks the line that comes closest to all the countries at once. The error margins allow for countries in the same region resembling each other, using 7 World Bank regions. The q-value corrects for testing all 12,497 pairs at once, using the Benjamini–Hochberg method. Underlying data last updated DYB 2024. How the country data works · explore Corruption Perceptions Index and Fixed broadband
This page shows that two measures go together. It does not show that Corruption Perceptions Index changes Fixed broadband, or the reverse. These figures also describe countries, not individual people. See the ecological fallacy.
More links with Corruption Perceptions Index or Fixed broadband