Computational Statistics to Tackle Modern Slavery
Lead Research Organisation:
University of Birmingham
Department Name: School of Mathematics
Abstract
If we are to meet the United Nation's Sustainable Development Goals by their target of 2030, we need to develop better statistical methods to map the prevalence of vulnerable populations. In this fellowship, I will A. carry out foundational research into effective computational statistics methods for hidden populations, B. use the methods to map modern slavery at local, national and international levels, and C. work with my project partners to change policy based on our evidence-based research.
To meet the Sustainable Development Goals, we need to measure how close we are to meeting them, quantify who is most in need of support and evaluate how successful interventions are in creating sustainable development. Take, for example, victims of modern slavery. Victims are often marginalised and hidden, with abuses going unreported and unmonitored. Estimating how many victims there are, where the abuses are happening and evaluating the effectiveness of interventions to support victims remain a challenge to the field of modern slavery and sustainable development more broadly. Data about victims and abuses is often noisy, poor quality or simply not collected. Developments in computational statistics can be really powerful here. They will provide a framework to deal with poor quality and missing data, while simultaneously avoiding specific and arbitrary assumptions about how the abuses are happening. Current methods require researchers to make specific assumptions about the abuses they are modelling which are difficult to justify from the data. The methods I develop will move away from this, instead making more general, mathematical assumptions. This will allow the data to speak for itself and can provide better counterfactual evidence and more realistic conclusions. To meet this aim, I bring a strong track record of developing these methods for epidemics, where my methods have been shown to reduce the need for specific assumptions when the data is poor quality.
However, this flexibility comes at the cost of a larger computational burden, increased uncertainty in the results, and a requirement for technical expertise when using the methods. To speed up progress to meeting the Sustainable Development Goals, researchers need methods that can be used in practice. I will lead the development of effective computational statistical methods. By reducing the computational burden, providing mechanisms to deal with the uncertainty in the results, and making methods easy to implement, they will become much more attractive to non-statisticians. I have already shown how my developments can considerably reduce the data collection burden when mapping poverty, making these methods more attractive to research and organisations working in poverty reduction. A key part of this fellowship is collaboration with a research software engineer who can develop data systems and software that other researchers and organisations can use to implement my methods.
I will use my methods to solve pressing problems in modern slavery and advance the field to meet the UN's goal to end slavery by 2030. I will work with my project partners to map modern slavery at local, national and international levels. This fellowship has the potential to save lives and show how computational statistics can advance progress towards the Sustainable Development Goals. By leveraging support from my project partners, I will influence politicians and policy makers to use my results to safeguard victims and prevent potential victims from suffering from modern slavery abuses.
To meet the Sustainable Development Goals, we need to measure how close we are to meeting them, quantify who is most in need of support and evaluate how successful interventions are in creating sustainable development. Take, for example, victims of modern slavery. Victims are often marginalised and hidden, with abuses going unreported and unmonitored. Estimating how many victims there are, where the abuses are happening and evaluating the effectiveness of interventions to support victims remain a challenge to the field of modern slavery and sustainable development more broadly. Data about victims and abuses is often noisy, poor quality or simply not collected. Developments in computational statistics can be really powerful here. They will provide a framework to deal with poor quality and missing data, while simultaneously avoiding specific and arbitrary assumptions about how the abuses are happening. Current methods require researchers to make specific assumptions about the abuses they are modelling which are difficult to justify from the data. The methods I develop will move away from this, instead making more general, mathematical assumptions. This will allow the data to speak for itself and can provide better counterfactual evidence and more realistic conclusions. To meet this aim, I bring a strong track record of developing these methods for epidemics, where my methods have been shown to reduce the need for specific assumptions when the data is poor quality.
However, this flexibility comes at the cost of a larger computational burden, increased uncertainty in the results, and a requirement for technical expertise when using the methods. To speed up progress to meeting the Sustainable Development Goals, researchers need methods that can be used in practice. I will lead the development of effective computational statistical methods. By reducing the computational burden, providing mechanisms to deal with the uncertainty in the results, and making methods easy to implement, they will become much more attractive to non-statisticians. I have already shown how my developments can considerably reduce the data collection burden when mapping poverty, making these methods more attractive to research and organisations working in poverty reduction. A key part of this fellowship is collaboration with a research software engineer who can develop data systems and software that other researchers and organisations can use to implement my methods.
I will use my methods to solve pressing problems in modern slavery and advance the field to meet the UN's goal to end slavery by 2030. I will work with my project partners to map modern slavery at local, national and international levels. This fellowship has the potential to save lives and show how computational statistics can advance progress towards the Sustainable Development Goals. By leveraging support from my project partners, I will influence politicians and policy makers to use my results to safeguard victims and prevent potential victims from suffering from modern slavery abuses.
Publications
Abubakar AM
(2024)
Cognitive impairment and exploitation: connecting fragments of a bigger picture through data.
in Journal of public health (Oxford, England)
Breward C
(2025)
Modelling throughput through the justice system
Seymour R
(2024)
Scalable Bayesian inference for bradley-Terry models with ties: an application to honour based abuse
in Journal of Applied Statistics
Seymour R
(2025)
Comparative judgement modelling to map forced marriage at local levels
in The Annals of Applied Statistics
| Description | Although this award is still active, and in its earlier stages, we have made progress in developing methodologies that can be used to estimate the prevalence of and map modern slavery. My teams has evaluated crime linkage methods against the National Police Chief Councils new Covenant for AI in Policing and are now able to make recommendations about decision support tools for linking crimes. We have developed a probabilistic method that reduces the time analysts need to spend reviewing crimes. My team has mapped forced marriage and domestic servitude at ward level across multiple local authorities and has produced an experimental design which greatly reduces the amount of data that needs to be collected. I have been able to improve the spatial resolution of network scale up methods for working with modern slavery data. Overall, the outputs of this fellowship continue to be mathematically rigorous methods to estimate the prevalence of modern slavery, quicker and cheaper than existing methods. |
| Exploitation Route | We have produced software to implement our methods and this can be used by non-specialists. This has already been used by councils and local authorities across England to improve service provision, provide training and improve data sharing agreements. We have been able to use our findings to inform parliamentary debate (both through questions in parliament and select committee appearances). |
| Sectors | Government Democracy and Justice Security and Diplomacy |
| Description | My work has had international impact in ending modern slavery and violence against women and girls. This includes two policy changes (at the Home Office and the United Nations), and the training of 130 local authority staff. Cocreated with Nottinghamshire County Council, I led a team that developed a CPD course for safeguarding professionals in the county based on the research findings from my computational statistics research. This was funded by an EPSRC IAA grant I led. So far, 130 professionals have taken part in two sessions I delivered in partnership with Nottinghamshire County Council and one I delivered in partnership with Nottingham City Council. In 2024, I was an expert witness for the House of Lords Committee on the Moden Slavery Act (2015) and provided oral evidence as part of an evidence session on data and statistics relating to the Act. In August 2024, the Secretary General of the United Nations Antonio Guterres, released a report and recommendations Issue of child, early and forced marriage (A/79/308). This report discussed "fostering subnational data collection", which refers to the evidence I submitted about my research collecting data on forced marriage with local authorities. |
| First Year Of Impact | 2024 |
| Sector | Government, Democracy and Justice,Security and Diplomacy |
| Impact Types | Policy & public services |
| Description | Contribution to UN Secretary General Report on the issue of child, early and forced marriage |
| Geographic Reach | Multiple continents/international |
| Policy Influence Type | Citation in other policy documents |
| Impact | I made a submission explaining my work mapping forced marriage at local and council level, and how this has been used to train local decision makers. The report recommends governments "... collect data on child, early and forced marriage in a human rights compliant manner, to use available data to inform measures aimed at combating child, early and forced marriage". This follows a discussion in the report saying "Some contributions received for the report highlighted initiatives targeting influential community actors, including religious leaders, school authorities and local decision makers" (paragraph 51) and "In some of the submissions received, it was highlighted that even when general data on child, early and forced marriage are available, fostering subnational data collection ... leads to more effective, inclusive and equitable solutions and allows for better targeting of those in need of support". |
| URL | https://digitallibrary.un.org/record/4061310?ln=en&v=pdf |
| Description | House of Lords Modern Slavery Act Committee |
| Geographic Reach | National |
| Policy Influence Type | Citation in other policy documents |
| URL | https://publications.parliament.uk/pa/ld5901/ldselect/ldmodslav/8/8.pdf |
| Description | Independent Anti-Slavery Commissioner's Data Advisory Group |
| Geographic Reach | National |
| Policy Influence Type | Participation in a guidance/advisory committee |
| Description | Comparative Judgement Winter Workshop |
| Amount | £2,000 (GBP) |
| Funding ID | WS-2324-09 |
| Organisation | London Mathematical Society |
| Sector | Academic/University |
| Country | United Kingdom |
| Start | 12/2024 |
| End | 12/2034 |
| Description | Delivering Prevalence Estimation Training |
| Amount | £2,420 (GBP) |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 03/2025 |
| End | 05/2025 |
| Title | Comparative Judgement Comparison Interface |
| Description | This repository provides a web interface to facilitate the collection of comparative judgement data. It offers a highly configurable interface which only requires a configuration file and a set of image files as input. Data is stored in an SQLite database which is part of the standard python library so not additional database is required. |
| Type Of Technology | Software |
| Year Produced | 2024 |
| Open Source License? | Yes |
| Impact | Several councils, police forces and combined authorities have used this to analyse crime data in their local area. |
| URL | https://github.com/HiddenHarmsHub/comparison-interface |
| Title | speedyBBT |
| Description | A suite of functions that allow a full, fast, and efficient Bayesian treatment of the Bradley-Terry model. |
| Type Of Technology | Software |
| Year Produced | 2024 |
| Open Source License? | Yes |
| Impact | Several councils, police forces and combined authorities have used this to analyse crime data in their local area. |
| URL | https://cran.r-project.org/package=speedyBBT |
| Description | AI, Innovation and Human Behaviour Day |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | Local |
| Primary Audience | Public/other audiences |
| Results and Impact | 40 members of the public attended a morning on AI, Innovation and Human Behaviour. My team presented our work, ran a live demo and answered questions. |
| Year(s) Of Engagement Activity | 2024 |
| Description | House of Lords Modern Slavery Act Committee |
| Form Of Engagement Activity | A formal working group, expert panel or dialogue |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Policymakers/politicians |
| Results and Impact | I was an expert witness for the House of Lords Modern Slavey Act committee for session on data and statistics. |
| Year(s) Of Engagement Activity | 2024 |
| Description | IMA Public Lecture |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | Local |
| Primary Audience | Public/other audiences |
| Results and Impact | I gave a public talk about using statistics to tackle online child sexual abuse. Around 25 people attended an evening talk and asked questions afterwards. |
| Year(s) Of Engagement Activity | 2024 |
| URL | https://ima.org.uk/25009/scale-of-harm-estimating-the-prevalence-of-trafficking-to-facilitate-online... |
| Description | UK Policing Data Science Day |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Professional Practitioners |
| Results and Impact | I presented my work to around 30 police data scientists as part of the UK policing data science workshop. This led to increased understanding of how police can engage with universities. |
| Year(s) Of Engagement Activity | 2024 |
| Description | Workshop for West Yorkshire Police |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | Regional |
| Primary Audience | Professional Practitioners |
| Results and Impact | 15 safeguarding professionals attended an event I ran to share maps of forced marriage in West Yorkshire and how this could inform their practice. |
| Year(s) Of Engagement Activity | 2024 |
