# Data Dictionary - US Inflation - CPI, Core, Food & Energy CPI, PCE & PPI, cleaned monthly Parquet

**Units:** vary by `measure` - read the per-row `unit` column (overall: index (see unit column)).  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | Always US |
| `ts` | timestamp (UTC) | Observation month |
| `measure` | str | CPI / Core CPI / PCE / Core PCE / PPI |
| `value` | float | Index value |
| `unit` | str | Index base |
| `res_min` | int | Native resolution (monthly) |

*Source: Board of Governors of the Federal Reserve System (H.4.1; retrieved via FRED).*