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DESCRIPTION Supply-Side Food Self-Sufficiency Ratio (SSFSSR) – Official Reproducibility Archive Author: Goro Takahashi Email address: takaha@vega.aichi-u.ac.jp Institution: Aichi University Public Release Date: 7 March 2026 Version: 1.1 Zenodo DOI: https://doi.org/10.5281/zenodo.18897195 1. Overview This repository constitutes a methodological and data archive based on the published framework 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. This Version 1.1 release applies the 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 provides a public methodological implementation and reference dataset based on the published SSFSSR framework. 2.Structural Significance 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.pdf Formal derivation of the SSFSSR formula, variable definitions, and theoretical properties. (2) Appendix_A_Commodity_List.xlsx Commodity classification framework covering the 64 commodities used in this release. (3) Appendix_B_Primary_kcal_per_kg.xlsx Caloric conversion coefficients applied to primary commodities. (4) PPCR_Table.xlsx Primary Product Conversion Rates (PPCRs) for processed commodities. (5) SSFSSR_2023_Country_Dataset.xlsx Country-level SSFSSR results for 174 countries, based on the 64-commodity framework for reference year 2023. (6) SSFSSR_Global_Panel_2010-2023.xlsx Global panel dataset for the period 2010–2023. (7) SSFSSR_Maps_Global_2010-2023.zip Global maps in continuous and four-tier classified formats. (8) README_Methodological_Notes.pdf Technical rules, aggregation procedures, and version-control notes. 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 provides a public implementation archive of the SSFSSR framework. 8. Reference Article (Peer-Reviewed) The methodological framework corresponds to the peer-reviewed publication inAgriculture & Food Security: Takahashi, G. (2026). A new method for calculating the food self-sufficiency ratio: 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 This Zenodo archive is based on the published methodology and serves as a public implementation and dissemination repository under the 64-commodity framework. 9. Citation Takahashi, G. (2026). Supply-Side Food Self-Sufficiency Ratio (SSFSSR): Methodological archive and 2023 global dataset under the 64-commodity framework (Version 1.1) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.18897195 KEYWORDS SSFSSR food self-sufficiency food security PPCR primary product conversion rate food balance sheets FAOSTAT global dataset kilocalorie-based measurement comparative food policy LICENSE CC BY 4.0 VERSION POLICY Version 1.x: Dataset updates (no structural modification)Version 2.0: Structural methodological revision