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Socioeconomic Index for Small Areas (SEISA) - England map

SEISA Official statistics under development

SEISA is a UK-wide area-based measure of deprivation first developed by HESA in 2021

For help using the map please see the video below.

Using the maps


Skip to: Dashboard basics (0:05) | Filters (3:04) | Search (5:48) | Map tools (8:01) | Table (11:53) | Troubleshooting (15:49) | Download video transcript (.txt)

In the tooltips and tables, you will see two decile columns. One of these is a UK-wide field, while the other is a country-specific variable. The decile you should use/refer to when exploring the maps or in any onward examination you conduct with the data (e.g. when using the ‘SEISA dataset’ on the ‘SEISA resources’ webpage) shall depend on the nature of your analysis. Below, we have supplied some indicative examples of how the decision may be made.

Scenario 1: You are using the measure for a UK-wide analysis (which does not involve any form of country comparisons).

In this instance, please use the 'SEISA decile UK' value. These deciles have been created by dividing all the small areas in the UK into ten equally sized groups.

Scenario 2: You are carrying out a country-specific analysis (e.g. England only) using SEISA.

In this situation, you should use the country-specific decile ('SEISA decile England'). These deciles are generated by dividing all the small areas in England into ten equal groups. The small areas of other countries are therefore excluded from the calculation of these deciles.

For example, 10% of UK small areas are in decile 1 of 'SEISA decile UK', but 8% of small areas in England are in decile 1 of 'SEISA decile UK'.

If you want to compare/analyse areas in England only, please use 'SEISA decile England'. In this variable, 10% of small areas in England are in decile 1, 10% are in decile 2 and so on.

Scenario 3: You are looking to compare statistics across nations using SEISA.

In this example, whether you use ‘SEISA decile UK’ or ‘SEISA decile England’ will be determined by the types of comparisons you are trying to make.

For instance, if your interest is in seeing how degree attainment (by neighbourhood deprivation) varies between English/Welsh/Scottish/Northern Irish providers, it is likely that you will use ‘SEISA decile UK’. This is because providers may recruit students from across the UK.

On the other hand, if you wanted to explore whether those living in the most deprived neighbourhoods in England were less likely to access postgraduate research study in England (when compared with the equivalent figure for the other nations), you would need to carry out the analysis using country-specific deciles for each nation before making the comparison.

Otherwise, the findings could be driven by the fact that small areas are unevenly distributed across deciles in the ‘SEISA decile UK’ field by nation (please see the appendix of our technical report for further information on this). That is, higher access figures could be due to a greater proportion of small areas for a particular country emerging in the lowest decile/quintile of the UK-wide variable.

open-data   Open data licence: CC-BY-4.0


Siobhan Donnelly
Archie Bye

SEISA pages


Please email [email protected] with comments on this experimental statistics release

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