Data sources for indicator scores
The analysis on which the Hays Global Skills Index was based utilised data as of Q2 2018. Developments subsequent to this date are not reflected in the 2018 findings.

Labour freedom
Heritage Foundation, Index of Economic Freedom

Improvements in education levels
Barro and Lee dataset (www.barrolee.com)

Change in economic participation rate (overall)
Oxford Economics Global Macro Model

Change in economic participation (15-24 year olds)
International Labour Organization (ILO)

Change in economic participation (55-64 year olds)
International Labour Organization (ILO)

Economic participation rate rank
International Labour Organization (ILO)

Long-term unemployment rate
Organisation for Economic Co-operation and Development (OECD), National statistical agencies

Vacancies (000s)
Organisation for Economic Co-operation and Development (OECD), Eurostat, National statistical agencies

GDP (LC, real, billion)
Oxford Economics Global Macro Model

GDP growth (real)
Oxford Economics Global Macro Model

Population (mn)
Oxford Economics Global Macro Model

Real earnings
Oxford Economics Global Macro Model

Earnings by industry
National statistical agencies

Earnings by occupation
National statistical agencies

Unemployment rate
Oxford Economics Global Macro Model

GDP/head (LC, real)
Oxford Economics Global Macro Model

Non-Accelerating Inflation Rate of Unemployment (NAIRU)
Oxford Economics Global Macro Model

CPI inflation
Oxford Economics Global Macro Model

Net migration
US Government

International Surveys of Educational Attainment in reading, mathematics, and science PISA: Programme for International Student Assessment (OECD)
TIMSS: Trends in International Mathematics and Science Study (Boston College,
TIMSS & PIRLS International Study Center)
PIRLS: Progress in International Reading Literacy Study
PIAAC: Programme for the international assessment of adult competencies (OECD) LLECE: Latin American laboratory for assessment of the quality of education (UNESCO) Educational Attainment (UNESCO)