A New Method for Calculating the Food Self-Sufficiency Ratio: Supply-Side Food Self-Sufficiency Ratio (SSFSSR), Version 1.2—Formal Specification, PPCR Structural Coefficients, 64-Commodity Framework, and 2023 Global Dataset (174 Countries)

DESCRIPTION Note: This record corresponds to the peer-reviewed article published in Agriculture & Food Security.Journal DOI: https://doi.org/10.1186/s40066-025-00570-z The earlier preprint version is available at: https://doi.org/10.5281/zenodo.13740850 注記: 本レコードは、Agriculture & Food Security に掲載された査読済み出版論文に対応しています。ジャーナル版 DOI: https://doi.org/10.1186/s40066-025-00570-z 旧プレプリント版は下記にあります。https://doi.org/10.5281/zenodo.13740850 Supply-Side Food Self-Sufficiency Ratio (SSFSSR) – Official Reproducibility Archive Author: Goro Takahashi Email address: [e-mail] Institution: Aichi University Public Release Date: 7 March 2026 Version: 1.1 Zenodo DOI: https://doi.org/10.5281/zenodo.18897195 Web Application: https://ssfssr-app.github.io/ssfssr-app/ For users who need specific country-year values without downloading the full dataset, please use the web application above. For researchers who require the complete dataset, please download it here. 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: 64Missing_Commodities_Count: Number of commodities within the predefined list for which supply data are unavailable for a given country.Reference_Year: 2023Unit: 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.20286760 10. Policy Brief (Multilingual) A multilingual policy brief introducing SSFSSR for policymakers and government officials. Available in English, Japanese, French, Spanish, and Chinese (Simplified). Open directly in any browser: https://ssfssr-app.github.io/ssfssr-app/Does_Your_Country_Grow_Enough_Food.htm 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供给侧粮食自给率（Supply-Side Food Self-Sufficiency Ratio, SSFSSR）——官方可复现存档 作者：高桥吾郎（Goro Takahashi） 电子邮箱：[e-mail] 所属机构：爱知大学（Aichi University） 公开发布日期：2026年3月7日 版本：1.1 Zenodo DOI：https://doi.org/10.5281/zenodo.18897195 Web应用：https://ssfssr-app.github.io/ssfssr-app/ 针对仅需特定国家-年份数据而无需下载完整数据集的用户，请使用上述Web应用；如需完整数据集的研究人员，请在此处下载。 1. 概述 本仓库为基于《供给侧粮食自给率（SSFSSR）》1.0版公开框架构建的方法学与数据存档。 SSFSSR是对传统生产-供给比固有扭曲进行修正的国家级粮食自给率结构性修订指标。该指标引入了初级产品转换率（Primary Product Conversion Rates, PPCR），可在聚合前将加工（次级）商品转换为初级当量单位。 设： = 商品索引 = 热量系数（千卡/千克） = 总供给量（千克） = 国内生产量（千克） = 初级产品转换率 所有数量在聚合前均转换为千卡单位。 SSFSSR的正式定义为： 该结构确保加工商品在全国聚合前被归一化为初级当量供给量。 本1.1版基于FAOSTAT粮食平衡表（2010年至今），将该框架应用于64种全球重要粮食商品，并提供174个国家的国家级结果（参考年份：2023年）。本仓库提供基于公开SSFSSR框架的公开方法学实现与参考数据集。 2. 初级产品转换率的结构意义 PPCR并非单纯的转换系数，其分析意义直接源自SSFSSR公式。 由于PPCR仅出现在分母中： 若代表将初级商品加工为制成品的效率提升，则分母会降低，在初级生产保持不变的情况下，SSFSSR会升高。 因此： SSFSSR可在不扩大初级生产规模的前提下提升。 供应链效率成为国家级粮食自给率的独立决定因素。 该指标衡量的是结构效率，而非仅生产规模。 这一特性将粮食自给率的分析解读从生产能力拓展至粮食系统转型效率。 3. 内容与文件顺序 (1) SSFSSR_Specification_v1.0.pdf：SSFSSR公式的正式推导、变量定义与理论属性说明。 (2) Appendix_A_Commodity_List.xlsx：涵盖本版本所用64种商品的商品分类框架。 (3) Appendix_B_Primary_kcal_per_kg.xlsx：适用于初级商品的热量转换系数。 (4) PPCR_Table.xlsx：加工商品的初级产品转换率（PPCR）表。 (5) SSFSSR_2023_Country_Dataset.xlsx：基于64种商品框架的174个国家2023年参考年份SSFSSR国家级结果数据集。 (6) SSFSSR_Global_Panel_2010-2023.xlsx：2010-2023年全球面板数据集。 (7) SSFSSR_Maps_Global_2010-2023.zip：2010-2023年全球连续分级与四级分类格式地图。 (8) README_Methodological_Notes.pdf：技术规则、聚合流程与版本控制说明。 4. 数据集结构（SSFSSR_2023_Country_Dataset.xlsx） 识别变量 Country_Name（国家名称）、ISO3_Code（ISO3国家代码）、Year（年份） 核心指标变量 SSFSSR_percent（SSFSSR百分比）、SSFSSR_ratio（SSFSSR比值） 结构组成变量 Domestic_Primary_Equivalent_Total = Σ(d w_i × C_i) （国内初级当量总供给） Processed_Primary_Converted_Total (supply) = Σ(w_i × PPCR_i × C_i) （加工商品转换后的初级当量总供给） Primary_Component_Total (supply) = Σ(w_i × C_i) （初级商品总供给） 覆盖变量 国家数量：174；所用商品数量：64；缺失商品数：某国在预定义商品列表中缺乏供给数据的商品数量；参考年份：2023；单位：千卡/年。 所有数量在聚合前均以千卡为单位表示。 5. 核心方法学规则 缺失值处理：未进行统计插补，缺乏足够生产或供给数据的观测值将被排除。 负供给值处理：若总供给<0，则替换为0并在内部分层标记。 聚合流程： 1. 使用PPCR将加工商品转换为初级当量单位； 2. 将所有数量转换为千卡单位； 3. 在国家级层面进行聚合。 SSFSSR（%）=（国内初级当量总供给 / 调整后总供给）× 100 6. 可复现性说明 所有计算均可通过以下方式完全复现： - FAOSTAT粮食平衡表（2010年至今） - 64种商品框架 - 提供的PPCR系数 - 正式规范文档 无需使用专有数据。 7. 理论贡献 SSFSSR将供给归一化与加工效率结构性整合至粮食自给率测度中。 通过将PPCR直接嵌入指标分母，SSFSSR从形式上证明：加工效率的提升可在不增加初级生产的前提下提升国家级粮食自给率。 这代表粮食自给率分析从以生产为中心的评估，结构性拓展至以系统效率为中心的评估。 本仓库提供SSFSSR框架的公开实现存档。 8. 同行评议参考论文 本方法学框架对应发表于《Agriculture & Food Security》的同行评议论文： 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 本Zenodo存档基于已发表的方法学，作为64种商品框架下的公开实现与传播存档。 9. 引用格式 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.20286760 10. 多语言政策简报 面向政策制定者与政府官员的SSFSSR多语言政策简报，提供英语、日语、法语、西班牙语与简体中文版本。可直接在任意浏览器中打开：https://ssfssr-app.github.io/ssfssr-app/Does_Your_Country_Grow_Enough_Food.htm 关键词 SSFSSR、粮食自给率、粮食安全、PPCR、初级产品转换率、粮食平衡表、FAOSTAT、全球数据集、基于千卡的测度、比较粮食政策 许可协议 CC BY 4.0 版本政策 1.x版本：数据集更新（无结构性修改）；2.0版本：方法学结构性修订