Classification of Westminster Parliamentary constituencies using e-petition data
EPJ Data Science volume 6, Article number: 16 (2017)
In a representative democracy it is important that politicians have knowledge of the desires, aspirations and concerns of their constituents. Opportunities to gauge these opinions are however limited and, in the era of novel data, thoughts turn to what alternative, secondary, data sources may be available to keep politicians informed about local concerns. One such source of data are signatories to electronic petitions (e-petitions). Such e-petitions have risen greatly in popularity over the past decade and allow members of the public to initiate and sign an e-petition online, with popular e-petitions resulting in media attention, a response from the government or ultimately a debate in parliament. These data are thus novel in their availability and have not yet been widely used for research purposes. In this article we will use the e-petition data to show how semantic classes of Westminster Parliamentary constituencies, fitted as Gaussian finite mixture models via EM algorithm, can be used to typify constituencies. We identify four classes: Domestic Liberals; International Liberals; Nostalgic Brits and Rural Concerns, and illustrate how they map onto electoral results. The findings and the utility of this approach to incorporate new e-petitions and adapt to changes in electoral geography are discussed.
Knowledge of an area’s characteristics is important in gaining an understanding of the needs of those who live in, work in or service the area. Whilst each area is unique, some areas will be very similar to others and some will be distinct. The classification or geodemographic segmentation of areas allows for those areas that are similar in nature to be grouped together as identifiable classes. These classes are usually established by using multi-variate data to characterise an area and then grouping together areas whose characteristics are broadly similar (Everitt et al. ). Given the nature of these data, there is the potential for these classes to be dispersed over space, with neighbouring areas belonging to different classes (Berry and Linoff ).
Classification can be applied at any level of geographic scale, from small neighbourhoods (Office for National Statistics ; Gale et al. ) through to municipalities (Office for National Statistics ). They can also be designed for general use or bespoke for a particular topic, e.g. use of technology (Longley et al. ), retail (CallCredit ), leisure (CACI ), health (CACI ) or well-being (CACI ). Some are produced by commercial organisations using a combination of open source data (e.g. Census) and their own in-house survey data (CACI ; Experian ) whilst others are open and produced by government bodies or academics using public data (Classification of Workplace Zones for England and Wales ; Greater London Authority ).
In this study we form classifications of Westminster Parliamentary Constituencies (WPCs) which are characterised by the political sentiment of their constituents. Each of these 650 WPCs consists of around 70,000 electors who return a member to the House of Commons in the United Kingdom (UK) national Parliament, and their term lasts typically 5 years (Figure 7 provides a map of these WPCs). Only registered British nationals, Irish nationals and citizens of Commonwealth countries are allowed to vote in Westminster Parliamentary elections; citizens of other countries, including European Union citizens are not entitled to vote in such elections. Here the sentiment in each WPC is captured using the volume of signatories to e-petitions (Wright ) hosted on the UK Parliaments petitions web site. The UK Parliaments e-petitions system was established in 2006 (Miller ) and in its present form is administered by a Parliamentary committee. Anyone can set up such an e-petition, requiring only five co-signatories, and the government will respond to any e-petition that receives over 10,000 signatories. Those that receive over 100,000 signatories are additionally considered for debate in Parliament. A particularly successful e-petition can gain media attention, allowing its message to reach a wider audience. Individuals outside the UK are also allowed to sign e-petitions, but their participation is mapped to their country of residence and not a WPC (in reality around 98% of signatories are from the UK). This study will consider those e-petitions which have been debated during the current Parliament, from July 2015 to February 2017. Whilst UK e-petitions date back to 2006, these older e-petitions pre-date the formation of the previous government and data available before May 2015 is not geocoded. For this study there are 51 such e-petitions. The list of e-petitions, with the topic, number of signatories and the open and close dates are given in Table 1.
Information from such e-petitions are beginning to be widely used to monitor and understand the political discourse (Briassoulis ). This has included: examinations of how e-petitions have the potential to influence the interactions between politicians and policy makers (Bochel and Bochel ; Hough ; Dumas et al. ); the pattern of engagement with e-petitions and how to characterise this interaction (Huang et al. ; Puschmann et al. ); a textual analysis of the wording of the e-petition text (Hagen et al. ) to establish if certain topic influence the popularity of petitions; and how referendum outcomes correlate with the volume of e-petition signatories (Hanretty ).
The following section of this article will discuss the techniques used for identifying classes and section three will introduce the e-petitions data in more detail. Section four provides the results and diagnostics. The final section discusses the implications of the study and its wider utility.
Various techniques exist to estimate classifications in n-dimensional space described using multi-dimensional data (Berry and Linoff ). Of the two broad approaches, partitioning and hierarchical classification, it is the former approach adopted in this article. The most often applied partitioning approach is k-means. To start the estimation process, for a given number of classes, initial class centres in n-dimensional space are defined. Then, at each iteration an assignment of data points to the nearest class centre takes place. After this assignment, the class centres are re-calculated (see (Wu et al. ) Figures 1 and 2 for an illustration of this process). As the algorithm proceeds these adjustments to the class centres become smaller and the process stops when a level of convergence is achieved. There are no underlying distributional assumptions associated with this technique, it is entirely data-driven, but it is possible to make an ad-hoc assessment of the goodness of fit by measuring the within class sum of square differences from class means. However this measure is only suitable for judgements amongst alternative classification arrangements where the number of classes is the same, since this sum of squares will never increase as the number of classes increases. This approach makes the fitting of classes using k-means a highly subjective exercise. Other drawbacks are that the classes formed by k-means are ‘spherical’ in nature, having the same dimensions in each direction and also the classification outcome can be sensitive to the initial choice of class centres.
Here an alternative approach of Gaussian finite mixture model estimation via an Expectation-Maximisation algorithm is used. This approach assumes an underlying distributional model for the classes and is therefore able to measure goodness of fit amongst a range of alternative parameterisations of the model (Melnykov and Maitra ; Fraley and Raftery ). Each class is described by a multivariate Gaussian distribution with an n-dimensional mean vector (the equivalent of class centres) and a variance-covariance structure (a measure of within class spread). As each iteration progresses these distributions ‘move’ to create tighter clusters around a sub set of data points until a level of convergence is achieved. The goodness of fit of each parameterisation (the number of classes and the ‘orientation’ of the classes) can be assessed using a Bayesian Information Criteria (BIC) that ‘penalises’ parameterisations that have greater numbers of classes. Unlike with k-means, it is therefore possible to identify the best fitting parameterisation across a range of classes. Also the shape of the classes is not constrained to be ‘spherical’ as with k-means, they can be elongated and orientated on certain dimensions. The drawback to this approach is that it relies on an assumption that the shape of the classes can be best represented as Gaussian distributions. A further drawback is that the assignment of areas to classes is soft, each area has a finite probability of belonging to each class. In practice however this information on the fuzziness of the class membership can actually be informative, but if a hard class allocation is required, the decision can be taken to allocate the area to the most probable class.
The classification is performed in R using the mclust package (R Core Team ; Scrucca et al. ). As described above, most classification techniques are sensitive to the initial starting configuration. To help mitigate this the function randomPairs() is called to obtain a random hierarchical structure suitable for the initial classification partition.
Mclust(petitions_p_elect[,-(1:5)], initialization =
randomPairs(petitions_p_elect[,-(1:5)], seed = 123)))
Where petitions_p_elect is an R dataframe of WPCs (rows) and e-petitions (columns) that expresses the number of e-petition signatories as a proportion of the WPC electorate. The first five columns are row descriptors for the WPC (namely, the Office for National Statistics code, the WPC name, the name of the MP, their political party and the 2015 electorate). This dataframe is available within the R Workspace supplied as Additional file 1.
In this study use is made of the data on the UK Parliament’s e-petitions web site (Houses of Parliament ). After an e-mail verification, the UK Parliament’s Petitions committee collects the signatures for each e-petition and geo-locates them according to the location of the signatory. These data are provided as a JSON formatted file that provides the counts for each e-petition allocated to a country (if outside the UK) or to a WPC (if inside in the UK). The process of requiring a confirmation email and a postcode ensure that the veracity of the data is high when allocated to the area of residence (British Broadcasting Corporation ). The count of signatories is also updated frequently for those e-petitions that are live (Yasseri et al. ).
The e-petitions cover a variety of topics (see Table 1), with the most popular an e-petition on a second EU referendum which attracted over 4 million signatures. The themes range from health, immigration, education, foreign affairs and animal welfare. Often opposing e-petitions are launched, e.g. one to ban and another to promote a state visit by the United States’ President, Donald Trump, or one to keep grouse shooting and another to ban it.
The JSON data are provided as raw counts but the size of the registered electorate in each WPC varies, from Na h-Eileanan an Iar (Western Isles) in Scotland with just under 22k electors up to the Isle of Wight with just under 110k electors. Thus a count of say, 500 signatories represents a greater level of concern in Na h-Eileanan an Iar than the Isle of Wight. To normalise the signatory counts, the number of signatories is divided by the size of the WPC electorate. The higher this proportion the more the politically active residents of the WPC (be they either registered voters or those who take the time to sign the e-petition) agree with the e-petition. The lack of a compatible divisor for those countries with signatories outside the UK means that they are excluded from this study, which just concentrates on the 650 WPCs.
When looking at the distribution of signatories for e-petitions amongst WPCs there are some that are concentrated in just a few WPCs. For example the e-petition number 108944 to ‘Save British Steel making. Scunthorpe, Teesside, Port Talbot etc.’ has 36% of its signatories in just two WPCs that are heavily impacted by the proposed closure (Scunthorpe and Brigg and Goole) (Figure 1(a)) and e-petition 112342 which calls on the Government to ‘Stop the destructive ’building our future’ office closure programme in HMRC’ has 21% of its signatories located in just 10 WPCs (Figure 1(b)). E-petition 162934 to ‘Force child cancer to the forefront of the NHS and government funding schemes’ is also concentrated in just a few WPCs (Figure 1(c)). In the context of this article, the geographical dominance of these three e-petitions makes them least informative and encourages the classification algorithm to form classes dominated by these single issues. Solutions including these highly concentrated e-petitions perform less well in terms of generalisability. Users wanting to replicate this methodology would be advised to identify and remove e-petitions which are ‘greedy’, where few WPCs consume a large proportion of the signatories. Following this reasoning, these three e-petitions are dropped from analysis, which leaves 48 e-petitions.
Figure 2 shows a correlation plot generated by the R package corrplot with the e-petitions re-ordered using the first principal component order, ‘FPC’, option (Wei and Simko ). Positive correlations are shown as blue whilst negative correlations are shown as red. Larger circles denote stronger correlations. Two distinct groupings of e-petitions form, where they have a positive relationship with those in the same group and a negative relationship with those in the other group. These two groups of e-petitions are identified by their grouping label in Table 1. Group GL e-petitions are broadly left leaning, liberal whilst group GC are more conservative in their intent. The middle, group GM are those which don’t correlate strongly with either group, or within themselves.
The implementation of Gaussian finite mixture models used here estimates a range of possible models using a combination of class configurations (See Figure 2 and Table 3 of Scrucca et al. ) and numbers of components/classes and selecting the combination that gives the highest BIC goodness of fit. For these data, the algorithm estimates a model with four classes with Gaussians that are ellipsoidal, variable in size but with equal orientation (VVE). The BIC measure of goodness of fit for this model is 365,576.6 and the BICs for the competing models are shown in Figure 3 (some models cannot be estimated for some cluster class sizes). Since this method is a soft assignment of WPCs to classes, Figure 4 plots the certainty of the assignment to the most probable class. This shows that a very high proportion of the assignments are almost 100% certain and also in Figure 5 this certainty is mapped by WPC, illustrating that there is little or no spatial clustering in this measure.
The centres (in 48 dimensions) of these four classes are established and an index calculated that measures the level of support expressed by these centres relative to the mean level of support for that e-petition. This measures how important the e-petition is to the signatories who live in WPCs belonging to the class, an index of 2.0 indicates that this e-petition is twice as likely to be signed by people in these WPCs than people in all WPCs. Table 2 identifies the top 10 e-petitions that have the highest index of support in each class, along with a title and brief description.
4.1 Pen portraits of the classes
To better understand the nature of the classes that have been identified, it is instructive to look at those e-petitions that have a high value for this index in each class and see if there are any common sentiments. If such sentiments can be identified then a short title can be provided that captures this commonality. This has been done with the four classes identified.
Domestic Liberals (110 WPCs). These e-petitions are very anti-BREXIT, asking that article 50, to leave the EU is never triggered, and that if it is, the UK Parliament should make that decision and there should be a second referendum before leaving the EU. Support is also high for issues that the state should intervene on, i.e. a tax on sugary drinks, a ban on non-recyclable packaging, recognition for the arts in education, an end to trading in ivory and measures to protect the bee population. For a class that appears to support liberal causes there is an absence in the top ten of issues that take place outside the UK, e.g. the war in Syria and the status of Donald Trump.
International Liberals (115 WPCs). This class complements to some degree the Domestic Liberal class. Uniquely, it does have high support for those international causes (Syria, Trump) and is also pro-Immigration. There is some overlap with Domestic liberals in having some anti-BREXIT support and concern over environmental issues, but the importance of domestic state intervention is not as well supported.
Nostalgic Brits (276 WPCs). This class gives high support to issues that may reflect a bygone age: Greater support for the police; less immigration; greater parental say over school attendance; better treatment of soldiers and less interference from the EU. These are very conservative issues.
Rural Concerns (149 WPCs). This is also a conservative class. E-petitions with a pro-BREXIT sentiment receive strong support and there is a desire to spend less money on international aid. There is, however, also support for some distinctive e-petitions. There is strong support for both banning and keeping grouse shooting, having more restrictions on the sale of fireworks (which can traumatise animals), and a ban on the ivory trade.
Figure 6 shows scatter plots of these support indices within each class. Only the Domestic Liberals and International Liberal classes show possible support for each other (with a ‘middling’ \(r=0.57\)). The International Liberals and Nostalgic Brits are have the strongest relationship, all be it a negative one (\(r=-0.84\)). Rural Concerns do not significantly correlate with either Domestic Liberals or Nostalgic Brits and only correlate negatively with International Liberals (\(r=-0.58\)).
A map showing the spatial arrangement of these classes for the UK (Figure 7(a)) and London (Figure 7(b)) provides further context to the classes. The support for the Rural Concern class is evident in the larger rural WPCs of England and Wales, but there are none of these classes in Scotland or Northern Ireland. In Scotland and Northern Ireland, many issues around rural concerns have devolved responsibility away from the Westminster Parliament, to their respective Parliament and Assembly (e.g. agriculture, environment and land use planning) which would motivate few from Scotland or Northern Ireland to participate in such e-petitions. Liberals (both Domestic and International) are concentrated in London and the surrounding Home Counties, with a significant number in the more rural parts of Scotland. Nostalgic Brits are to be found in the urban areas of England, Scotland and the Welsh Valleys.
In this article we have used novel data in a way that allows new insights and provides empirical understanding of a complex political system. Use has been made of these data, namely e-petitions, to identify a set of classes that typify WPCs according to the political sentiment expressed by these e-petitions. Using the technique of Gaussian finite mixture model classification, four classes are identified and shown to be meaningful and coherent in terms of the aspects of the political discourse that they cover. Two liberal classes are identified that are concentrated in and around London, one conservative class to be found in the urban centres and a distinct class concerned with rural issues. Elsewhere, looking at individual survey data, Sanders  also identified four classes in the UK electorate, two of his classes are liberal (a left and a centre-right variant) that were in tune with a less-harsh foreign policy but approve of human rights interventions, and two authoritarian classes (with centre and right variants) that disapprove of the EU and have a negative assessment of the impact of immigration.
Further insight into the utility of these classes can be gained by seeing how these classes map onto other outcomes. Perhaps the most obvious politically, is the outcome of the 2017 General election for each WPC. Table 3 cross-tabulates the outcome of the 2017 General election with the class membership of the WPC. The Conservative party enjoys most support in the Rural Concerns class with little support in the International Liberals class. The Labour party is strongly represented in both the International Liberals and the Nostalgic Brits classes, which are perhaps the two most opposite classes, which suggest a broad range of issues that underlie the party’s support (Goodwin and Heath ). Looking at voting intention, Sanders  also noted a large proportion of those intending to vote Labour categorised in the Centre-Right and Authoritarian Centre classes. The large support for the Scottish National Party in Scotland at the 2017 General election gives it a broad representation in three of the four classes.
A second more methodological comparison is with the official Output Area Classification (OAC) (Gale et al. ) which classifies small areas, of typically 125 households, using 2011 Census data. Table 4 show the percentage of the OAC classes that are also in each of the WPC classes. The majority of Constrained City Dwellers (56%), Hard-Pressed-Living (57%) and Multicultural Metropolitans (51%) OACs are to be found our Nostalgic Brits classes. The strong representation of a class termed Multicultural Metropolitan in our Nostalgic Brits class is a surprise. Less surprising is that OAC classes Cosmopolitans (66%) and Ethnicity Central (74%) are most likely to be in our International Liberals class. Finally, just under 50% of the Rural Residents OAC are in our Rural Concerns class (48%), which is to be expected.
A number of issues arise around the conduct of this study. Firstly, the signatories to these e-petitions are probably not a representative sample of the population in a WPC, they are those who feel some motivation to express their views on the topic of the e-petition. In terms of electoral outcome however, capturing the opinions of these people is important since, if they can be motivated to visit a web site, enter their details and then click on a confirmatory email, they may be more likely to vote in an election. A second issue is that to progress the study it is necessary to normalise the number of signatories by the size of the electorate in each WPCs, however the pool of signatories is not necessarily the same as those registered to vote. Whilst anyone can sign an e-petition only those individuals aged over 18 and meeting nationality criteria can be registered to vote. However there may be some commonality between the two groups in that they are both politically engaged samples, either through their decision to sign an e-petition or register to vote. Thirdly, we do not know the motivation for the individual to sign an e-petition. For example, the two e-petitions to not intervene in the Syrian Conflict may be signed by the more liberal who were ‘scared’ by the recent interventions in Iraq and Afghanistan and have no wish to repeat that outcome. They may also be signed by those who are more conservative and think that British lives should not be deployed ‘…because of a quarrel in a far away country between people of whom we know nothing’ (Chamberlain ). Given that these two e-petitions sit firmly in our International Liberals class, the first motivation appears to be the most likely. The fourth point is that the subject matters of these e-petitions are quite repetitious and polarising, with little representation of more nuanced middle ground positions on certain themes. There are some themes that are not even covered, e.g. transport, defence, the environment or social issues. Finally, there is the issue of apparent contradictions, exemplified by the outcome that the e-petition to ban grouse shooting and the separate e-petition to keep grouse shooting are strongly supported in the same class, Rural Concerns. This is not really a conundrum since in the local community where grouse shooting occurs, there may be strongly held views on both sides, thus both e-petitions attracting a lot of support on this locally contentious issue.
This approach to classifying areas can be applied more widely. As data from new e-petitions becomes available this exercise may be repeated to both test the stability of these classifications and reveal changing trends (Singleton et al. ). Thus it will be possible to get a contemporary picture of political sentiment around the country, removing the need to be reliant on out of date decennial Census data, geographically sparse and incomplete opinion poll data, or sporadic household survey data. Also if these new e-petitions capture a new dimension of the political discourse (e.g. transportation or international defence) then additional insight may be gained when they are incorporated. This classification technique also can be applied to a new political geography to inform policy makers and campaigners about the nature of the new geography. The UK is currently going through a process of re-drawing the WPC boundaries to reflect population changes and a mandated reduction in the number of MPs from 650 to 600 (Johnston et al. ; Johnston et al. ). To work with this new geography, all that is required is that the signatories be geo-relocated to the new constituencies and the classification carried out on the new 600 WPCs. The types of class that will emerge from such an exercise may be different to the four identified here but may provide some pointers as the political sentiment in these new WPCs. Also, rather than a re-shaping of an existing geography, a separate political geography may be of interest, possibly the constituencies in the devolved Scottish Parliament and Welsh and Northern Ireland Assemblies or electoral wards in Local Municipalities (Bochel and Bochel ), and classes can be identified using either the UK Parliaments e-petition data or data from be-spoke e-petition systems.
In this study we have shown that there is meaningful information in the responses to such e-petitions and that this can have an impact that shapes perceptions of the political debate in each constituency. Sensible and savvy political parties and local politicians should exploit these data more fully to gauge and potentially tailor their message for the electorate (Hough ). Internationally, given the increased use of such systems in legislators around the world (Directorate-General for Internal Policies ), the methodology adopted here can be applied elsewhere.
The Group identifies e-petitions that are broadly Left leaning (L), Conservative (C) or Middle of the road (M). NA are petitions not included in the analysis.
The initial letter indicates the general theme of the e-petition: Immigration, Education, Health, Politics, Libertarian; followed by a brief description; and finally the e-petition id, as given in Table 1.
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The authors would like to acknowledge the UK Parliaments Petitions committee for the open access to their data. They would also like to thank the reviewers who provided comments on an earlier draft of this article.
The work was funded by the ESRC Consumer Data Research Centre, Grant No ES/L011891/1.
BREXIT, Britain exiting from the EU; DUP, Democratic Unionist Party; EM, Expectation-Maximisation; EU, European Union; HMRC, Her Majesty’s Revenue and Customs; LD, Liberal Democrat; MP, Member of Parliament; NHS, National Health Service; OAC, Output Area Classification; PC, Plaid Cymru; SF, Sinn Féin; SNP, Scottish National Party; UK, United Kingdom of Great Britain and Northern Ireland; VVE, Ellipsoidal, variable volume, variable shape, equal orientation; WPC, Westminster Parliamentary constituencies.
Availability of data and materials
The R Workspace containing the data frame of raw counts and proportions of the electorate are available as Additional file 1.
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The data used in this study has been downloaded from the official UK Parliaments web site. It contains only counts in aggregate and no personal data is identifiable.
There are no competing interests.
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The data preparation and analysis was conducted by Stephen Clark. The first draft was written by Stephen Clark. Michelle Morris and Nik Lomax made suggested changes and comments for subsequent drafts. All authors read and approved the final manuscript.
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Clark, S., Lomax, N. & Morris, M.A. Classification of Westminster Parliamentary constituencies using e-petition data. EPJ Data Sci. 6, 16 (2017). https://doi.org/10.1140/epjds/s13688-017-0113-9