Scottish Government

The Scottish Index of Multiple Deprivation (SIMD) 2009 identifies small area concentrations of multiple deprivation across all of Scotland in a fair way.

SIMD 2009 is an update with improvements on the SIMD 2006 and uses the same geographical base as the SIMD 2006 and the SIMD 2004 of datazones. Due to changed data sources and improvements to indicators and methodology, the overall SIMD 2009 and most domains are not directly comparable in absolute terms with those in the SIMD 2006. The only domain that is directly comparable between SIMD 2009 and SIMD 2006 is the employment domain. As such, this domain is used for analysis of absolute change.

The SIMD provides a relative measure of deprivation which means that the main output from SIMD - the SIMD ranks - can be used to compare data zones by providing a relative ranking from most deprived (rank 1) to least deprived (rank 6,505). The SIMD cannot be used to determine 'how much' more deprived one data zone is than another e.g. it is not possible to say that data zone X, ranked 50, is twice as deprived as data zone Y, ranked 100.

The SIMD can be used to identify Scotland's most deprived small areas on the overall index and each individual domain, commonly by applying a cut off such as 10%, 15% or 20%. The cut off should be informed by whether it aims to target areas with the very highest concentrations of deprivation or to be wider ranging.

All three of the versions SIMD 2009, SIMD 2006 and SIMD 2004 are heavily based on the methodology developed by the Social Disadvantage Research Centre at the University of Oxford.

In developing an area-based measure of deprivation, the Scottish Index of Multiple Deprivation was the Scottish Executive's response to the August 2003 report 'Measuring Deprivation in Scotland : Developing a Long-Term Strategy'.

The final report and the Scottish Executive response are available here:

Measuring Deprivation in Scotland : Developing a Long-Term Strategy and Scottish Executive response

The Scottish Index of Multiple Deprivation 2009 combines 38 indicators across 7 domains, namely: income, employment, health, education, skills and training, housing, geographic access and crime.

The overall index is a weighted sum of the seven domain scores. The weighting for each domain is based on the relative importance of the domain in measuring multiple deprivation, the robustness of the data and the time lag between data collection and the production of the SIMD. The domain weightings were subject to sensitivity analysis to assess the effects of any changes in weights on the overall index ranks.

Prior to weighting, the domains are standardised by ranking the scores. The ranks then undergo a statistical transformation to avoid high ranks in one domain 'cancelling out' low ranks in another. The domain weightings used in SIMD 2009, expressed as a % of the overall weight are: current income (28%), employment (28%), health (14%), education (14%), geographic access (9%), crime (5%) and housing (2%).

Decisions on changes to the methodology used to create the SIMD, and the indicators included in it, are made in conjunction with data providers and the ScotStat Measuring Deprivation Advisory Group (MDAG).

Full technical details on the methodology and construction of each indicator in the SIMD 2009 are available in the SIMD 2009 Technical Report available from the Publications section.

Alongside the Technical Report are various papers relating to methodology which are categorised below.

General

• Visual of SIMD 2009 methodology - a useful visual providing an overview of the SIMD 2009 methodology.
• Visual of SIMD 2006 methodology - a useful visual providing an overview of the SIMD 2006 methodology.
• Evaluation of SAS coding used to construct the SIMD 2006 & SIMD 2009 - a review of the quality of the statistical programs used in SIMD 2006 which was also used for SIMD 2009 by the Robertson Centre for Biostatistics, University of Glasgow.

Geography

• Development of the datazone geography - a description of the development of the datazone geography.

Change Over Time

• Change over time guidance paper - this paper gives guidance on how to carry out change over time analysis. Whilst there have been changes to the SIMD methodology and indicators used over the three versions of the SIMD it is still possible to look at change over time though care needs to be taken because of the changes.

Employment

• Effect of using more recent employment data - this paper analyses the effects of using more recent July 2008 - June 2009 data on both the Employment Domain and the overall SIMD 2009.

Income

• Impact of tax credit data - this paper looks at the impact of including tax credit data in the domain. The figures presented here are based on 2008 benefits data (using 2007 data to identify children in benefit households) as used in SIMD 2009, with and without 2006 tax credit data.

Health

• Analysis of indicator code change - this paper analyses the impact on the overall Health domain to assist users in understanding the comparability between the SIMD 2006 health domain and that used in SIMD 2009.

Geographic Access

• Domain methodology - this paper covers the developments since SIMD 2004 leading to the methodology of the Access domain in SIMD 2009.
• Sensitivity analysis of sub-domain weight change - this paper explores whether or not it is justifiable to make a change to the drive time:public transport sub-domain weights of ¾:¼ in the calculation of SIMD 2009.
• Public Transport travel times methodology - a description of the public transport travel times methodology used in the Geographic Access domain.
• Drive time methodology - a description of the drive time methodology used in the geographic access domain.
• Analysis of retail centre information - description of the public access to retail centres variable used in SIMD 2006.