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Who we are

With research staff from more than 60 countries, and offices across the globe, IFPRI provides research-based policy solutions to sustainably reduce poverty and end hunger and malnutrition in developing countries.

researcher spotlight

Liangzhi You

Liangzhi You is a Senior Research Fellow and theme leader in the Foresight and Policy Modeling Unit, based in Washington, DC. His research focuses on climate resilience, spatial data and analytics, agroecosystems, and agricultural science policy. Gridded crop production data of the world (SPAM) and the agricultural technology evaluation model (DREAM) are among his research contributions. 

Where we work

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Where we work

IFPRI currently has more than 600 employees working in over 80 countries with a wide range of local, national, and international partners.

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experts

Markets, Trade, and Institutions

Vivian Hoffmann

Senior Research Fellow

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Bio

Vivian Hoffmann is a Senior Research Fellow in the Markets, Trade, and Institutions Unit and an Associate Professor of Economics and Public Policy and Administration at Carleton University in Ottawa, Canada. Much of Hoffmann’s research has focused on two themes: household preventive health behavior and farmer adoption of agricultural technologies. Current projects include randomized evaluations of agronomy training in Uganda, and interventions to improve food safety practices among meat processors and retailers in Kenya, Viet Nam, and Ethiopia. Hoffmann also serves as the Deputy Lead of the CGIAR One Health Initiative. She holds a PhD in Applied Economics from Cornell University.

Publications

CV

Publications

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Journal Article

Self-selection versus population-based sampling for evaluation of an agronomy training program in Uganda

2024Hoffmann, Vivian; Doan, Miki Khanh; Harigaya, Tomoko
Details

Self-selection versus population-based sampling for evaluation of an agronomy training program in Uganda

One of the challenges in evaluating the impact of agronomy training programs, particularly on downstream impacts such as yield, is identifying a sample of farmers who are likely to participate in the training. We assess farmers’ participation in a farm business training activity before the agronomy training intervention as a sample identification mechanism. The screening activity was designed to appeal to the same group of farmers targeted by a coffee agronomy training program, while having minimal impact on the program’s goal of increasing coffee yields. A three-session training on farm business management was conducted in 22 study villages in central Uganda. Coffee agronomy training was then offered in half of these villages, based on random assignment. The results show that 52% of coffee farmers who attended the first business training session subsequently attended agronomy training, compared to 22% of those identified through a census. Applying these results to the design of a large ongoing randomised controlled trial, we find that using a self-selected sample reduces the minimum detectable effect of agronomy training on coffee yield to 15.83%, compared to 38% if population-based sampling were used.

Year published

2024

Authors

Hoffmann, Vivian; Doan, Miki Khanh; Harigaya, Tomoko

Citation

Hoffmann, V., Doan, M.K. and Harigaya, T. Self-selection versus population-based sampling for evaluation of an agronomy training program in Uganda. Journal of Development Effectiveness 16(4): 375-385. https://doi.org/10.1080/19439342.2023.2236080

Country/Region

Uganda

Keywords

Africa; Eastern Africa; Agronomy; Coffee; Capacity Building

Language

English

Access/Licence

Limited Access

Links

https://doi.org/10.1080/19439342.2023.2236080 Source record

Project

One Health

Record type

Journal Article

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Report

Uganda coffee agronomy training: Impact evaluation report

2024Hoffmann, Vivian; Murphy, Mike; Harigaya, Tomoko
Details

Uganda coffee agronomy training: Impact evaluation report

This report describes the methods and findings of a randomized controlled trial evaluating the impact of coffee agronomy training and phone-based advisory services on farmer practices and observed coffee yield. In-person training was provided in randomly selected villages over the course of two years by Hanns R. Neuman Stiftung (HRNS) and TechnoServe in two separate regions of Western Uganda encompassing six districts. Messages reinforcing this training were sent to a subset of farmers in villages where training was offered by Precision Development (PxD), and standalone messages were sent to a subset of farmers in villages where no training was offered. The program period spanned the onset of the COVID-19 pandemic and associated lockdowns, which significantly affected how training could be delivered and likely reduced its impact.

Year published

2024

Authors

Hoffmann, Vivian; Murphy, Mike; Harigaya, Tomoko

Citation

Hoffmann, Vivian; Murphy, Mike; and Harigaya, Tomoko. 2024. Uganda coffee agronomy training: Impact evaluation report. Washington, DC: International Food Policy Research Institute. https://hdl.handle.net/10568/149080

Country/Region

Uganda

Keywords

Africa; Eastern Africa; Sub-saharan Africa; Agronomy; Coffee; Crop Yield; Impact Assessment; Costs

Language

English

Access/Licence

Open AccessCC-BY-4.0

Source

Source record

Project

Policies, Institutions, and Markets

Record type

Report

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Report

FarmUSE: Assessment of antimicrobial use in poultry farms

2024Muloi, Dishon M.; Ibayi, Eugine L.; Murphy, Mike; Njaramba, Jane; Nielsen, S.S.; Hoffmann, Vivian; Moodley, Arshnee
Details

FarmUSE: Assessment of antimicrobial use in poultry farms

Antimicrobial use in livestock systems is thought to be a key driver for the development of antimicrobial resistance (AMR). Therefore, efforts to reduce antimicrobial use are seen as a key intervention to controlling AMR. Understanding the patterns of antimicrobial use in different production systems is essential. Antimicrobials are commonly used in poultry production for disease treatment, prevention and, to an extent, growth promotion. In low- and middle-income countries, surveillance of antimicrobial use in animals is hampered by the lack of standardised data collection tools and reporting systems across different countries and regions. To address this gap, these tools were developed and adapted to poultry broiler production systems to support the collection of comprehensive data related to demographics, production and antibiotic usage data. The tools are designed for both retrospective and prospective data gathering.

Year published

2024

Authors

Muloi, Dishon M.; Ibayi, Eugine L.; Murphy, Mike; Njaramba, Jane; Nielsen, S.S.; Hoffmann, Vivian; Moodley, Arshnee

Citation

Muloi, D.M., Ibayi, E.L., Murphy, M., Njaramba, J., Nielsen, S.S., Hoffmann, V. and Moodley, A. 2024. FarmUSE: Assessment of antimicrobial use in poultry farms. Nairobi, Kenya: ILRI.

Country/Region

Kenya

Keywords

Africa; Eastern Africa; Antimicrobial Resistance; Data; Poultry

Language

English

Access/Licence

Open AccessCC-BY-4.0

Source

Source record

Project

One Health

Record type

Report

Blogs

Training Ugandan coffee farmers on agronomy practices more than pays for itself
IFPRI Blog
 | 
August 05, 2024

Training Ugandan coffee farmers on agronomy practices more than pays for itself

By Vivian Hoffmann

Promise for boosting yields and income.

World Food Safety Day 2024: Empowering consumers and small businesses with information
IFPRI Blog
 | 
June 06, 2024

World Food Safety Day 2024: Empowering consumers and small businesses with information

By Vivian Hoffmann

Targeting interventions to benefit public health.

The challenges of influencing consumer behavior to improve food safety
IFPRI Blog
 | 
August 31, 2020

The challenges of influencing consumer behavior to improve food safety

By Vivian Hoffmann and Emily Wu

Two studies in Kenya examine risk perceptions of aflatoxin in maize.

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Events

Implications of El Niño 2023/24 for Africa South of the Sahara
IFPRI Policy Seminar

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November 29, 2023, 7:30 – 9:00 am

Implications of El Niño 2023/24 for Africa South of the Sahara

Virtual Event: November 29, 2023 at 7:30am-9:00am EST. IFPRI in collaboration with USAID FEWS NET and NASA’s Goddard Space Flight Center, is hosting a presentation on the potential impact of the upcoming El Niño on the global agrifood system, with special emphasis on low-income countries in Africa South of the Sahara. The event will be organized around four short talks.

5th Annual Agriculture, Nutrition & Health (ANH) Academy Week
IFPRI Program/Country Event

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June 30 to July 2, 2020

5th Annual Agriculture, Nutrition & Health (ANH) Academy Week

IFPRI is participating in ANH Academy Week that will bring together a community of researchers, practitioners and policymakers from across the world working at the intersection of agriculture, nutrition and health to foster knowledge exchange, innovation and learning, touching on COVID-19’s impacts on our shared work. Presenter(s) Title Date Time John McDermott Welcome Remarks  30-Jun  9:00am John […]

2018 Agricultural & Applied Economics Association (AAEA) Annual Meeting
IFPRI at External Event

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August 5 to 7, 2018

2018 Agricultural & Applied Economics Association (AAEA) Annual Meeting

IFPRI will participate in the 2018 AAEA meeting. The AAEA addresses agricultural economics, international and rural development, and more.

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News

January 13, 2020 | In the News

Kenyans love maize. But aflatoxins are making it dangerous (BMJ Journals)

BMJ Journals reported on the dangers and ways to prevent aflatoxin poisoning. The findings from two IFPRI studies were referenced in the article, the first by Research Fellows Vivian Hoffmann and Jef Leroy and Kelly Jones, The impact of reducing dietary aflatoxin exposure on child linear growth: a cluster randomised controlled trial in Kenya, and […]

November 26, 2019 | In the News

What must be done to get toxin out of Kenya’s food supply (The Conversation)

The Conversation published a Q & A article with Research Fellow Vivian Hoffmann on her insights about aflatoxins, a poisonous, toxic chemical produced by a fungus (Aspergillus flavus). Aflatoxins are found in many of Kenya’s popular maize flour brands. Hoffman discusses how to reduce and eventually eliminate aflatoxins in food and the roles that farmers, […]