Expected schooling vs. Hours worked (PWT)
Holds up after adjusting for income
Across 127 countries, Expected schooling and Hours worked (PWT) rise and fall together at r = -0.46 (on a scale from −1 to +1, where 0 means no link). It holds up almost unchanged when only countries with similar income (GDP per person) are compared (r = -0.33, q = 0.0013, allowing for the many pairs tested).
Comparing countries across the middle half of hours worked (PWT), 1,647 to 2,178 hours per year, expected schooling is worse by 2.35 years at the top of that range than the bottom. Comparing only countries with similar national income, the gap is 0.988 years.
Link before adjusting (r)-0.458p = 6.0e-8 · 127 countries
After adjusting for national income-0.330p = 0.000 · likely range [-0.48, -0.17]
p, allowing for regions0.001standard error 0.053 · 7 regions
Check for luck (q)0.001across 18,622 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.
Expected schooling · yearslink with income +0.81 · proxy
Hours worked (PWT) · hours per yearlink with income -0.40 · moderate
“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 | -0.458 | 6.0e-8 | 127 |
| By rank (Spearman), not adjusted | -0.467 | 3.2e-8 | 127 |
| Standard (Pearson), adjusted for national income | -0.330 | 0.000 | 127 |
| By rank (Spearman), adjusted for national income | -0.258 | 0.003 | 127 |
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 127 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: +0.128 (a minus sign means it grew).
How solid is it?
Leaving out one country at a time, r ranges from -0.368 (without SYR) to -0.292 (without QAT). 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: QAT (+0.039).
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 | 14 | -0.61 | |
| Europe & Central Asia | 47 | -0.26 | |
| Latin America & Caribbean | 15 | -0.27 | |
| Middle East, North Africa, Afghanistan & Pakistan | 18 | +0.04 | |
| Sub-Saharan Africa | 28 | -0.29 |
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 | 43 | -0.15 | |
| Middle third | 42 | -0.31 | |
| Richest third | 42 | -0.51 |
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 | 74 | -0.28 | |
| Muslims | 36 | -0.14 |
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 | 16 | +0.18 | |
| Never a European colony | 17 | -0.16 | |
| Spain | 14 | -0.38 | |
| United Kingdom | 35 | -0.44 |
By official ideology
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 | ||
|---|---|---|---|
| Nationalist | 21 | -0.27 | |
| No strong official ideology | 85 | -0.33 |
By party system
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 | ||
|---|---|---|---|
| A few parties banned | 18 | -0.25 | |
| No parties banned | 93 | -0.29 |
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 = -0.330 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 34years. 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 = +0.058, 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 expected schooling moved did not tend to see their hours worked (PWT) move with it.
Across countries (adjusted)-0.330for comparison
Within countries-0.338each country vs itself
…and vs the same year elsewhere+0.058q = 0.653 · 129 countries
Year-on-year changes+0.010q = 0.888
The direction flips. Comparing each country only with itself gives -0.34. Also taking out what happened to the whole world each year gives +0.06. So the first figure was picking up a trend both measures share with worldwide progress, not a link between them.
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.
- Much of the within-country association disappears once shared global year effects are removed, which points to a common worldwide trend rather than a country-level relationship.
3,399 country-years (one country in one year), 129 countries, 1990–2023, about 26 years each on average. Share of the variation that happens within countries over time: 7% for Expected schooling, 18% for Hours worked (PWT). 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): +0.058. 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
years | hours per year | Years | |
|---|---|---|---|
| Greece GRC | 20.8 | 1,893 | 2023 |
| Australia AUS | 20.7 | 1,611 | 2023 |
| Turkiye TUR | 19.8 | 1,747 | 2023 |
| Finland FIN | 19.5 | 1,497 | 2023 |
| New Zealand NZL | 19.3 | 1,708 | 2023 |
| Ireland IRL | 19.2 | 1,654 | 2023 |
| Belgium BEL | 19 | 1,593 | 2023 |
| Sweden SWE | 19 | 1,432 | 2023 |
| Iceland ISL | 18.9 | 1,452 | 2023 |
| Argentina ARG | 18.8 | 1,612 | 2023 |
| Norway NOR | 18.8 | 1,412 | 2023 |
| Denmark DNK | 18.7 | 1,380 | 2023 |
| Netherlands NLD | 18.6 | 1,439 | 2023 |
| Spain ESP | 17.8 | 1,638 | 2023 |
| United Kingdom GBR | 17.8 | 1,523 | 2023 |
United Nations Development Programme, Human Development Report 2025
Feenstra, Robert C., Robert Inklaar and Marcel P. Timmer (2015), "The Next Generation of the Penn World Table", American Economic Review, 105(10), 3150-3182, www.ggdc.net/pwt. Data: Penn World Table version 11.0, Groningen Growth and Development Centre, doi:10.34894/FABVLR.
Sources
Expected schooling
Expected years of schooling
United Nations Development Programme, Human Development Report Office · via Our World in Data · CC BY 3.0 IGO · updated annual
The years a child starting school today can expect to spend in it, if current enrolment rates hold. It is a forecast built from the same UNESCO enrolment figures the site already has, so it moves with them.
Hours worked (PWT)
Average annual hours worked per person engaged (Penn World Table)
Groningen Growth and Development Centre, University of Groningen · via DataverseNL · CC BY 4.0 · updated irregular (new versions every few years)
Hours actually worked in a year, averaged over everyone with a job, including the self-employed and part-timers. It measures the same thing as the OECD hours measure, and for countries in both the two mostly agree. This one is kept because it reaches much further: about 130 countries each year from 2010 to 2023, where the OECD series has 38 countries and stops in 2016. Before 2000 it covers mainly rich countries. No "better" direction is set.
How this was computed
Data used: most recent value in 2010-2025; values come from 2023. 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 18,622 pairs at once, using the Benjamini–Hochberg method. Underlying data last updated V-Dem v16; V-Party v2. How the country data works · explore Expected schooling and Hours worked (PWT)
This page shows that two measures go together. It does not show that Expected schooling changes Hours worked (PWT), or the reverse. These figures also describe countries, not individual people. See the ecological fallacy.
More links with Expected schooling or Hours worked (PWT)
- Expected schooling vs Secondary enrollment before +0.84 → after adjusting +0.59
- Gender score vs Hours worked (PWT) before -0.58 → after adjusting -0.53
- Hours worked (PWT) vs Political rights (FH) before +0.58 → after adjusting +0.50
- Civil liberties (FH) vs Hours worked (PWT) before +0.57 → after adjusting +0.49
- Hours worked (PWT) vs Legal system and property rights (Fraser) before -0.55 → after adjusting -0.48
- Hours worked (PWT) vs Price level before -0.55 → after adjusting -0.46
- Fixed broadband vs Hours worked (PWT) before -0.52 → after adjusting -0.45
- Health spending vs Hours worked (PWT) before -0.54 → after adjusting -0.44