> ## Documentation Index
> Fetch the complete documentation index at: https://docs.datacircle.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Data Quality

> Independent accuracy evaluation of the DataCircle dataset.

# Data Quality

## Accuracy evaluation

Independent evaluation against live LinkedIn data (3,600 profiles sampled):

| Metric | Value | 95% CI |
| - | - | - |
| **Profile accuracy** | 76% | 74%-77% |
| **Email validity** | 56% | 53%-59% |
| Average profile freshness | 77 days | - |
| Average email verification age | 25 days | - |

**Profile accuracy breakdown:**

* 76% exact match (same person, same company, same title)
* 6% same company, different title
* 5% different company (person changed jobs)
* 8% we have company data but LinkedIn API doesn't return it
* 3% LinkedIn returns 404 (profile deleted/deactivated)


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