# Data Dictionary - U.S. Persistent Fails-to-Deliver Index - derived Parquet

**Units:** all `persist_days` values are in **consecutive days**.  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | Ticker symbol |
| `ts` | timestamp (UTC) | Settlement date |
| `persist_days` | float | Consecutive settlement dates with >=10k-share fails |
| `unit` | str | Unit |
| `res_min` | int | Native resolution (daily = 1440) |

*Source: U.S. Securities and Exchange Commission (SEC).*