3d700a33a8
Added authoritative U.S. GDP data from FRED/BEA covering 96 years of economic history: - Real GDP quarterly data: Q1 1947 - Q2 2025 (314 data points) - Real GDP annual data: 1929 - 2024 (96 data points) Includes comprehensive research-backed documentation: - Complete source verification (10 parallel research agents, 95%+ confidence) - Full methodology documentation and data quality standards - Download instructions, APIs, and update procedures - Historical context from Great Depression through COVID-19 Updated main README with Data directory documentation and dataset comparison table. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
94 lines
3.1 KiB
Markdown
94 lines
3.1 KiB
Markdown
# US-GDP Dataset Update Log
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This file tracks all updates, revisions, and changes to the U.S. GDP dataset in Substrate.
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---
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## 2025-10-16 - Initial Dataset Creation
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**Action**: Created US-GDP dataset with comprehensive research and documentation
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**Data Added:**
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- Real-GDP-Quarterly-1947-2025.csv (314 data points, Q1 1947 - Q2 2025)
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- Real-GDP-Annual-1929-2024.csv (96 data points, 1929-2024)
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**Source**: FRED (Federal Reserve Economic Data), sourcing from BEA
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- Quarterly Real GDP: FRED Series GDPC1
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- Annual Real GDP: FRED Series GDPCA
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**Research Process:**
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- 10 parallel research agents launched simultaneously
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- 20 total queries (10 primary, 10 follow-ups)
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- 3 research services used (Perplexity API, Claude WebSearch, Gemini)
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- 95%+ confidence level in source selection
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**Key Research Findings:**
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- BEA identified as primary official U.S. government source
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- FRED confirmed as most accessible distribution platform
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- Real GDP preferred over nominal for economic analysis
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- Quarterly data preferred for historical trend analysis
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- Data quality: Three-stage quarterly revision + annual comprehensive update
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**Coverage:**
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- **Quarterly**: Q1 1947 to Q2 2025 (78+ years)
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- **Annual**: 1929 to 2024 (96 years)
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- **Extended historical**: 1790+ available via MeasuringWorth (not included in this dataset)
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**Latest Data Points:**
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- Quarterly: Q2 2025: $23,770.976 billion (chained 2017 dollars)
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- Annual: 2024: $23,358.435 billion (chained 2017 dollars)
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**Documentation Created:**
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- README.md - Comprehensive dataset documentation with research methodology
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- RESOURCES.md - Data sources, APIs, download methods, update procedures
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- UPDATES.md - This file
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- US-GDP-1929-2025.md - Detailed metadata (pending)
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**Next Update Recommended**: After Q3 2025 third estimate release (expected late January 2026)
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---
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## Future Updates
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New updates will be added above this line in reverse chronological order (newest first).
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### Update Guidelines
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**When to Update:**
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1. After BEA releases third estimate for each quarter (most complete data)
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2. After BEA's annual comprehensive update in September (historical revisions)
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3. When methodology changes are announced by BEA
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**Update Process:**
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1. Download latest data from FRED
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2. Verify data integrity (row counts, date ranges, latest values)
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3. Cross-check with BEA news releases
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4. Update CSV files with new data
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5. Document changes in this file
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6. Update README.md if methodology or coverage changes
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7. Update main Data/UPDATES.md
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**Data Verification:**
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```bash
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# Check quarterly file
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wc -l Real-GDP-Quarterly-1947-2025.csv
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head -3 Real-GDP-Quarterly-1947-2025.csv
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tail -3 Real-GDP-Quarterly-1947-2025.csv
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# Check annual file
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wc -l Real-GDP-Annual-1929-2024.csv
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head -3 Real-GDP-Annual-1929-2024.csv
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tail -3 Real-GDP-Annual-1929-2024.csv
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```
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**BEA Release Schedule:**
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- Advance Estimate: ~30 days after quarter end
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- Second Estimate: ~60 days after quarter end
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- Third Estimate: ~90 days after quarter end ← **Best time to update**
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- Annual Comprehensive: September each year
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---
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**Maintained By**: Substrate Data Curation
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**Update Frequency**: Quarterly (after third estimate) + Annual (after September revision)
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