Supply-Side Food Self-Sufficiency Ratio (SSFSSR) Version 1.0: Formal Specification, PPCR Structural Coefficients, 64-Commodity Framework, and 2023 Global Dataset (174 Countries)
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Supply-Side Food Self-Sufficiency Ratio (SSFSSR) – Official Reproducibility Archive Author: Goro Takahashi Email address: takaha@vega.aichi-u.ac.jpInstitution: Aichi UniversityPublic Release Date: 7 March 2026Version: 1.0Zenodo DOI: https://doi.org/10.5281/zenodo.18889852 1. Overview This repository constitutes the official and complete reproducibility archive of the Supply-Side Food Self-Sufficiency Ratio (SSFSSR), Version 1.0. SSFSSR is a structurally revised indicator of national food self-sufficiency that corrects distortions inherent in conventional production-to-supply ratios. The index introduces Primary Product Conversion Rates (PPCR), which convert processed (secondary) commodities into primary-equivalent units before aggregation. Let: = commodity index = caloric coefficient (kcal per kg) = total supply quantity (kg) = domestic production quantity (kg) = primary product conversion rate All quantities are converted into kilocalories prior to aggregation. The SSFSSR is formally defined as: This structure ensures that processed commodities are normalized into primary-equivalent supply before national aggregation. Version 1.0 applies this framework to 64 globally relevant food commodities based on FAOSTAT Food Balance Sheets (2010–) and provides country-level results for 174 countries (reference year: 2023). This repository constitutes the authoritative methodological definition and reference implementation of SSFSSR Version 1.0. 2. Structural Implication of PPCR PPCR is not merely a conversion coefficient. Its analytical significance follows directly from the SSFSSR formula. Because PPCR appears exclusively in the denominator: A reduction in — representing improved efficiency in converting primary commodities into processed forms — reduces the denominator and therefore increases SSFSSR, holding primary production constant. Accordingly: SSFSSR can increase without expanding primary production. Supply-chain efficiency becomes an independent determinant of national food self-sufficiency. The indicator captures structural efficiency, not merely production volume. This property extends the analytical interpretation of food self-sufficiency beyond production capacity toward food system transformation efficiency. 3. Contents and File Order (1) SSFSSR_Specification_v1.0.pdfFormal derivation of the SSFSSR formula and theoretical properties. (2) Appendix_A_Commodity_List.xlsx64-commodity classification framework. (3) Appendix_B_Primary_kcal_per_kg.xlsxCaloric conversion coefficients. (4) PPCR_Table.xlsxPrimary Product Conversion Rates for processed commodities. (5) SSFSSR_2023_Country_Dataset.xlsxCountry-level results (174 countries, 64 commodities, 2023). (6) SSFSSR_Global_Panel_2010-2023.xlsx (7) SSFSSR_Maps_Global_2010-2023.zipContinuous and four-tier classified maps. (8) README_Methodological_Notes.pdfTechnical rules and version control. 4. Dataset Structure (SSFSSR_2023_Country_Dataset.xlsx) Identification Variables Country_Name ISO3_Code Year Core Indicator Variables SSFSSR_percent SSFSSR_ratio Structural Component Variables Domestic_Primary_Equivalent_Total = Σ(d w_i × C_i) Processed_Primary_Converted_Total (supply) = Σ(w_i × PPCR_i × C_i) Primary_Component_Total (supply) = Σ(w_i × C_i) Coverage Variables Number_of_Countries: 174 Number_of_Commodities_Used: 64 Missing_Commodities_Count: Number of commodities within the predefined list for which supply data are unavailable for a given country. Reference_Year: 2023 Unit: kilocalories per year All quantities are expressed in kilocalories prior to aggregation. 5. Core Methodological Rules Missing Values No statistical imputation is applied. Observations lacking sufficient production or supply data are excluded. Negative Supply Values If total supply < 0 → replaced with zero and internally flagged. Aggregation Procedure Convert processed commodities into primary equivalents using PPCR. Convert all quantities to kilocalories. Aggregate at the national level. SSFSSR (%) =(Domestic_Primary_Equivalent_Total / Adjusted_Total_Supply) × 100 6. Reproducibility Statement All calculations are fully reproducible using: FAOSTAT Food Balance Sheets (2010–) The 64-commodity framework The PPCR coefficients provided The formal specification document No proprietary data are required. 7. Conceptual Contribution SSFSSR structurally integrates supply normalization and processing efficiency into food self-sufficiency measurement. By embedding PPCR directly within the denominator of the index, SSFSSR formally demonstrates that improvements in processing efficiency can enhance national food self-sufficiency independently of increases in primary production. This represents a structural extension of food self-sufficiency analysis from production-centered evaluation toward system-efficiency evaluation. This repository establishes the reference implementation of SSFSSR Version 1.0. 8. Reference Article (Peer-Reviewed) The methodological framework corresponds to the peer-reviewed publication inAgriculture & Food Security: Takahashi, G. (2026). Supply-Side Food Self-Sufficiency Ratio: A structurally corrected approach to measuring national food self-sufficiency. Agriculture & Food Security.https://doi.org/10.1186/s40066-025-00570-z The Zenodo archive serves as the official reproducibility repository of the above article. 9. Citation Takahashi, G. (2026). Supply-Side Food Self-Sufficiency Ratio (SSFSSR), Version 1.0 [Data set]. Zenodo. https://doi.org/10.5281/zenodo.18889852
