No. 10: The Hungry Cities Food Purchases Matrix: A Measure of Urban Household Food Security and Food System Interactions
Bibliographic record
Abstract
Recent theoretical work has suggested that urban food security is the result of food system interactions. This work highlights the challenge of assessing household-level food insecurity and relating it to the broader food system. One priority is to develop food security metrics that incorporate household interactions with the food system retail environment. The Hungry Cities Food Purchases Matrix (HCFPM) is one such metric that has been developed for situating household food sourcing behaviour within the urban food system. The matrix has been successfully administered in a number of cities in the Global South by the Hungry Cities Partnership. This paper discusses the administration of the HCFPM in a 2014 household survey of Maputo in Mozambique and illustrates how it can provide unique insights into the interactions between households and the broader food system. The HCFPM therefore paves the way for a new frontier in urban food system research in cities of the Global South.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.004 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.003 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.009 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".