Birthday day derivation
Indicates how the day of birth was sourced (e.g., declared, modeled, or imputed at household level). Known or imputed for 226.2 million individuals — 90.6% of Faraday's identity graph.
At a glance
- Coverage today
- 90.6%
- Typical coverage
- 90.6%
- Individuals with a value
- 226.2M
- Share in largest category
- 64.7%
- Most values come
- from the person
- Latest collection
- May 1, 2026
How the categories split
n = 226,245,234Share of individuals in each category. 2 categories, with 64.7% in the largest.
Category shares over time
Household Specific64.7% (largest)The 2 largest categories, each followed across 12 collections. Estimated from a 1% sample of individuals.
Coverage
Latest collection: 229,689,060 individualsCoverage by state
Percentage of individuals in each state with a value.
Coverage over time
90.6% todayShare of individuals holding a value at each monthly snapshot. A value carries forward for one year.
How we arrive at a value
Whether a value was observed on the person themselves, carried from their address, or estimated from the people around them.
- On the person — 100%
- A named person, from a record about that person.
- From address — 0%
- Not used for this attribute — no value is inherited this way.
- From geography — 0%
- Not used for this attribute — no value is inherited this way.
Coverage, in context
Where 90.6% sits on the catalog’s own coverage range.
Higher coverage than 45% of individual-level attributes in the catalog
Freshness
How recently this was collected, and how often a new collection arrives. Each bar is the number of individuals in that collection. Gaps are real — collection is periodic, not continuous.
Change between collections
The share of individuals whose category changed.
of individuals changed value between the two most recent collections — 52.8× steadier than the catalog median of 13.5%.
Contribution ledger
13 ingestions
1 authority contributed since Jul 2023.
| Observed | Ingested | Count | ID |
|---|---|---|---|
| 2026-05-01 | 2026-09-10 | 266,506,942 | c5492806… |
| 2026-03-01 | 2026-07-01 | 264,096,977 | 1181277b… |
| 2026-02-01 | 2026-07-02 | 264,777,400 | af53c569… |
| 2025-12-01 | 2026-08-11 | 268,508,091 | 84d6a1c5… |
| 2025-11-01 | 2026-08-11 | 268,299,874 | a071c538… |
Technical details
- API name
- birthday_day_derivation
- Category
- fig/life_event
- Type · unit
- Text
- Statistical type
- nominal
- Allowed values
- null
- Derivations
- null
- Directionality
- null
- Deprecation
- false
In a payload
{
"attributes": {
"birthday_day_derivation": "Household Specific"
}
}