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