c1d6b0b9f8
Created new US-Inflation data directory with: - 945 monthly CPI-U observations from FRED/BLS (Jan 1947 - Aug 2025) - Comprehensive metadata documentation with methodology - README with source research and justification - UPDATES.md change log and update procedures - RESOURCES.md with data sources and API access - Structure mirrors existing COVID wastewater dataset Data source: FRED Series CPIAUCSL (CPI for All Urban Consumers, Seasonally Adjusted) Update frequency: Monthly (mid-month BLS releases) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
93 lines
2.9 KiB
Markdown
93 lines
2.9 KiB
Markdown
# Dataset Update Log
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This file tracks all updates to the U.S. Inflation (CPI) dataset.
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## Update Format
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Each entry should include:
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- **Date**: When the update was made
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- **Data Period**: Which time period the new data covers
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- **Source**: URL or reference to the data source
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- **Changes**: What was added, modified, or corrected
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- **Latest Value**: Most recent data point added
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---
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## 2025-10-07 - Initial Dataset Creation
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**Data Period**: 1947-01-01 to 2025-08-01
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**Source**: FRED (Federal Reserve Economic Data) - BLS Series CPIAUCSL
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**URL**: https://fred.stlouisfed.org/graph/fredgraph.csv?id=CPIAUCSL&cosd=1947-01-01
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### Changes
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- Created initial dataset with 945 monthly data points
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- Downloaded FRED series CPIAUCSL (CPI for All Urban Consumers, Seasonally Adjusted)
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- Data includes:
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- Observation dates in ISO 8601 format (YYYY-MM-DD)
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- CPI index values with 3 decimal place precision
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- Coverage from January 1947 through August 2025
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### Latest Value
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- **Month**: August 2025
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- **CPI Index**: 323.364
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- **Year-over-Year Change**: ~2.5% (from August 2024)
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- **Trend**: Moderating inflation, stabilizing near Federal Reserve 2% target
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### Coverage
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- **Start Date**: 1947-01-01 (earliest available in FRED series)
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- **End Date**: 2025-08-01 (most recent data)
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- **Total Records**: 945 monthly measurements
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- **Completeness**: 100% (no gaps in monthly series)
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### Files Created
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- `CPI-US-Monthly-1947-2025.csv` (main dataset)
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- `US-Inflation-CPI-1947-2025.md` (metadata documentation)
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- `README.md` (dataset documentation)
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- `RESOURCES.md` (data sources)
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- `UPDATES.md` (this file)
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### Data Quality Notes
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- All 945 months have complete data
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- No missing values or gaps in time series
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- Seasonally adjusted values from BLS
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- Index baseline: 1982-1984 = 100
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- Historical low: 21.480 (January 1947)
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- Current value: 323.364 (August 2025)
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- Total increase: 1,404% over 78-year period
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### Notable Context
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- Dataset captures major inflation episodes:
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- 1970s-1980s stagflation (peak ~14.8% annual)
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- Great Moderation (1990s-2000s stable ~2-3%)
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- Great Recession (2008-2009)
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- COVID-19 inflation surge (2021-2023, peak 9.1%)
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- Current normalization period (2024-2025)
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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 Schedule
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**Recommended Update Frequency**: Monthly
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**When to Update**:
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- BLS releases CPI data mid-month (typically 12th-15th)
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- FRED updates same day as BLS release
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- Check around the 15th of each month for new data
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**How to Update**:
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```bash
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cd Data/US-Inflation
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curl -s "https://fred.stlouisfed.org/graph/fredgraph.csv?id=CPIAUCSL&cosd=1947-01-01" -o CPI-US-Monthly-1947-2025.csv
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```
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**Update Checklist**:
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1. Download fresh CSV from FRED
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2. Verify row count increased by 1 (one new month)
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3. Check latest value is reasonable (typically 0.1-0.5% monthly change)
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4. Update this file with new entry
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5. Update "Last Updated" date in README.md and metadata file
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