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Procès Hissène Habré : Le statisticien fait état d’un taux de mortalité de 2,37% par jour

Les auditions d’experts se poursuivent au palais de justice de Dakar sur le procès de l’ex-président tchadien Hissène Habré. Hier, c’était au tour de Patrick Ball, seul inscrit au rôle, commis par la chambre d’accusation de N’Djamena pour dresser les statistiques sur le taux de mortalité dans les centres de détention.


The Forensic Humanitarian


Syria’s status, the migrant crisis and talking to ISIS

In this week’s “Top Picks,” IRIN interviews HRDAG executive director Patrick Ball about giant data sets and whether we can trust them. “No matter how big it is, data on violence is always partial,” he says.


A Statistical Analysis of the Guatemalan National Police Archive: Searching for Documentation of Human Rights Abuses.

Megan E. Price, Tamy Guberek, Daniel R. Guzmán, Paul Zador, Gary M. Shapiro (2009). “A Statistical Analysis of the Guatemalan National Police Archive: Searchingfor Documentation of Human Rights Abuses.”In JSM Proceedings, Survey Research Methods Section. Alexandria, VA: American Statistical Association.


Descriptive Statistics From Statements to the Liberian Truth and Reconciliation Commission

Kristen Cibelli, Amelia Hoover, and Jule Krüger (2009). “Descriptive Statistics From Statements to the Liberian Truth and Reconciliation Commission,” a Report by the Human Rights Data Analysis Group at Benetech and Annex to the Final Report of the Truth and Reconciliation Commission of Liberia. Palo Alto, California. Benetech.


Sierra Leone Statistical Appendix

Richard Conibere, Jana Asher, Kristen Cibella, Jana Dudukovic, Rafe Kaplan, and Patrick Ball. Sierra Leone Statistical Appendix, A Report by the Benetech Human Rights Data Analysis Group and the American Bar Association Central European and Eurasian Law Initiative to the Truth and Reconciliation Commission. October 5, 2004.


Missing People in Casanare

Daniel Guzmán, Tamy Guberek, Amelia Hoover, and Patrick Ball (2007). “Missing People in Casanare.” Benetech. Also available in Spanish – “Los Desaparecidos de Casanare.”


Por qué los datos casan con la hipótesis de que hubo genocidio


Data Security or Death


That Higher Count Of Police Killings May Still Be 25 Percent Too Low.

Carl Bialik of 538 Politics reports on a new HRDAG study authored by Kristian Lum and Patrick Ball regarding the Bureau of Justice Statistics report about the number of annual police killings, which was issued a few weeks ago. As Bialik writes, the HRDAG scientists extrapolated from their work in five other countries (Colombia, Guatemala, Kosovo, Sierra Leone and Syria) to estimate that the BJS study missed approximately one quarter of the total number of killings by police.


“El reto de la estadística es encontrar lo escondido”: experto en manejo de datos sobre el conflicto

In this interview with Colombian newspaper El Espectador, Patrick Ball is quoted as saying “la gente que no conoce de álgebra nunca debería hacer estadísticas” (people who don’t know algebra should never do statistics).


Meet the data analyst putting the perpetrators of genocide in prison

Biotechniques published an interview with Patrick Ball, inspired by his John Maddox Prize award.


Death rate in Habre jails higher than for Japanese POWs, trial told

Patrick Ball of the California-based Human Rights Data Analysis Group said he had calculated the mortality rate of political prisoners from 1985 to 1988 using reports completed by Habre’s feared secret police.


Africa

Chad Liberia Sierra Leone South Africa

Data coding and inter-rater reliability (IRR)

Data coding is the process of converting unstructured information, such as a narrative testimony, into discrete facts such as names and roles of actors (victims, witnesses, perpetrators) in crimes, as well as the date and place of act. Data coding must not discard or distort information. When more than one person is identifying, classifying and counting the elements reported in a qualitative source, the results of what they find may differ slightly based on each individual's interpretation and care in doing the coding. These differences can be measured by measuring IRR (inter-rater reliability). We give the same source document to several coders and ...

Sierra Leone TRC Data and Statistical Appendix

HRDAG assisted the Sierra Leone Truth and Reconciliation Commission in building a systematic data coding system, electronic database, and secure data analysis process to manage the thousands of statements given to them in the course of their work. HRDAG executive director Patrick Ball and HRDAG field consultant Richard Conibere worked at the TRC full-time for approximately eighteen months starting in March 2003. HRDAG worked with TRC researchers to help them incorporate quantitative findings to support the qualitative findings in their writing for the other chapters of the TRC report. In addition, HRDAG produced a Statistical Appendix to present ...

Evaluating gunshot detection technology

Bailey’s analysis stemmed from data we had access to as part of our ongoing collaboration with the Invisible Institute.

Scatter and keep working

Structural Zero Issue 02 July 17, 2025 Part Two of Our Three Part “Gathering the Data” Series. Read part one.  As a statistician, I spend most of my days working at a computer. Because I work with data about human rights violations, I go to places where I can document evidence of crimes—like disappearances, killings, and torture. So while I may just be working at a computer, those computers can be in places where there is still the potential for violence to emerge. Over the years, I’ve learned a lot about how to work in countries emerging from conflict. Those lessons seem especially applicable today, ...

How Many People Will Get Covid-19?

HRDAG has authored two articles in Significance that add depth to discussions around infection rates.

Scanning Documents to Uncover Police Violence

Administrative paperwork generated by police departments can hold evidence of police violence, but can present unique challenges for data processing.

Our work has been used by truth commissions, international criminal tribunals, and non-governmental human rights organizations. We have worked with partners on projects on five continents.

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