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Background Notes

Background Notes

CSO statistical release, , 11am

Sources and Methods

National Accounts provide a coherent and detailed picture of a country’s whole economy using international statistical standards. The regional accounts use the same standards to provide a regional picture of a country’s economy that is consistent with the national accounts. For this release, we have brought together the work done by the Central Statistics Office, the Northern Ireland Statistical Research Agency and the Office of National Statistics to provide a comparative, regional analysis of the economies of Ireland and Northern Ireland.

The economic analysis in the release draws on outputs from a range of sources:

Central Statistics Office

Annual National Accounts

County Incomes and GVA

Productivity in Ireland

Labour Force Survey

Earnings Analysis

Residential Property Prices Index

Office of National Statistics

Regional Accounts

Regional and Sub Regional Productivity

Northern Ireland Statistical Research Agency

Labour Force Survey

Annual Survey of Hours and Earnings

Northern Ireland Department of Finance

Northern Ireland House Price Index

Eurostat

Purchasing Power Parities

Definitions

Purchasing Power Parities

Purchasing price parities (PPPs) are used to convert euro and pound sterling into a common currency called the purchasing power standard (PPS). It acts as a currency converter and as an indicator of price level differences between Ireland and the United Kingdom. PPS is an artificial currency unit and is calculated by dividing the nominal value of a variable by the relevant PPP. One PPS can theoretically buy the same amount of goods and services in every country, enabling fair comparisons of economic volume, Gross Domestic Product (GDP), and living standards.

The categories of PPP used in this release are household final consumption expenditure and GDP.

PPPs are calculated by Eurostat and information on their methodology can be found on their website. The specific PPP values used in this release can be found in the Eurostat dataset.

Gross Value Added

Regional Gross Value Added (GVA) for Ireland is calculated using the income method and its components are given in current prices throughout. The regional GVA for Northern Ireland is calculated by balancing both the income and production approaches, more information can be found in the ONS regional accounts methodology.

Gross Value Added (GVA) and its components are calculated in current prices throughout. GVA is given as follows:

Gross value added at factor cost: 

Compensation of employees 

plus

Gross mixed income 

plus

Gross operating surplus

Gross value added in basic prices:

Gross value added at factor cost

plus

Non-product taxes

minus

Non-product subsidies

Gross domestic product at market prices:

Gross value added in basic prices

plus

Product taxes

minus

Product subsidies

Gross National Product:

Gross domestic product

plus

Factor income received from abroad

minus

Factor income sent abroad

Gross National Income:

Gross national product

plus

Subsidies received from abroad

minus

Subsidies sent abroad

Modified Gross National Income (GNI*):

Gross national income 

minus

Depreciation on intellectual property

minus

Depreciation on leased aircrafts

minus

Net factor income on redomiciled PLCs.

Gross Disposable Household Income

Disposable household income in this release is given as a gross figure. This approach differs from the disposable household income given in the County Incomes and GVA release which reports disposable household income as a net figure. The difference between net and gross disposable household income is depreciation.

For this release the gross figure was used in order to compare directly with the regional gross disposable household income provided by the ONS for Northern Ireland.

Gross disposable household income is calculated as follows:

Gross Primary Income

Household Primary Income is defined for National Income purposes as follows:

Compensation of employees (i.e. Wages and Salaries, Benefits in kind, Employers’ social insurance contributions)

plus

Gross mixed income

plus

Imputed rent of owner-occupied dwellings

plus

Net interest and dividends

The last component is a net item, which implies that interest payments by households are deducted in deriving primary income.

Gross Total Income

Total income is defined as:

Primary income from above

plus

Social benefits

plus

Other current transfers

Gross Disposable Income

Disposable income is defined as follows:

Total income

minus

Current taxes on income (e.g. Income taxes, other current taxes)

minus

Social insurance contributions (e.g. Employers, employees’, self-employed, etc.)

Labour Productivity

All definitions and standards are consistent with the Productivity in Ireland release.

Labour productivity is a measure of economic output relative to labour input, it is given as the GVA in chain-linked volumes (chain-linked to 2022) over the total hours worked in the economy.

Hourly compensation measures the cost of employing workers relative to labour input and is defined as the compensation of employees over total employee hours worked.

Unit Labour Cost (ULC) is the ratio of hourly compensation to labour productivity. It is used as a measure for competitiveness whereby if the economy’s ULC increases then competitiveness decreases, for example, the cost of labour may rise while output remains the same or falls.

Log growth rates: The growth rates for labour productivity, hourly compensation and ULC are log growth rates. A log growth rate is a logarithmic transformation of an ordinary growth rate. As many of the indices used in productivity analysis are related multiplicatively, using a log transformation allows for the relationships between these variables to be shown additively.

The formulae, as well as, more detailed information on all the concepts and definitions mentioned above can be found in the Productivity in Ireland release.

Dublin Belfast Economic Corridor

The Dublin Belfast economic corridor is the name given to the geographical area connecting the capital cities of Ireland and Northern Ireland. In Ireland the local authorities in the region are Dublin City, South Dublin, Dún Laoghaire-Rathdown, Fingal, Louth and Meath. In Northern Ireland, the local government districts in the corridor are Newry, Mourne & Down, Armagh City, Banbridge & Craigavon, Lisburn & Castlereagh and Belfast.

Classifications

Regional classifications

Ireland: County, NUTS 3 & NUTS 2.

Northern Ireland: Local Government Districts.

Economic activity

This release groups businesses by activity (also referred to as industry) using the EU’s Statistical Classification of Economic Activities in the European Community (NACE) Rev. 2 grouping.

Education classification

The classification categories used educational qualifications are the same as those used in Ireland and Northern Ireland - Joint Census Publication 2021 - 2022. The categories are described in Table 6.1.

Table 6.1 Education/Qualification Classification Comparison
Classification groups Ireland  Northern Ireland 
Basic qualification No formal education/ training, Primary education NFQ Levels 1 or 2, Lower Secondary NFQ Level 3 Junior/Inter/Group Certificate No qualifications/Level 1: 1 to 4 GCSEs, O levels, CSEs (any grades); 1 AS Level; NVQ level 1; or equivalent
Intermediate and advanced qualification Upper Secondary NFQ Levels 4 or 5 Leaving Certificate, Technical or Vocational NFQ Levels 4 or 5
Advanced Certificate/Completed Apprenticeship NFQ Level 6, Higher Certificate NFQ level 6
Level 2: 5 or more GCSEs (A*-C or 9-4), O levels (passes) CSEs (grade 1); 1 A level, 2-3 AS Levels; NVQ level 2, BTEC General, City and Guilds Craft; or equivalent
Level 3: 2 or more A Levels, 4 or more AS Levels; NVQ Level 3, BTEC National, OND, ONC, City and Guilds Advanced Craft; or equivalent
Higher and professional qualification Ordinary Bachelor NFQ level 7 up to Doctorate NFQ level 10 Level 4 and above: Degree (BA, BSc), foundation degree, NVQ Level 4 and above, HND, HNC, professional qualifications (teaching or nursing, for example); or equivalent
Other qualification   Other: Other qualifications, equivalent unknown; Apprenticeship
Qualification not stated Not Stated