Birthday day derivation

Text

Indicates how the day of birth was sourced (e.g., declared, modeled, or imputed at household level). Known or imputed for 235.1 million individuals — 91.3% of Faraday's identity graph.

235,088,585 people have this value. You only pay for people we match.

Append to a file

At a glance

Coverage today
91.3%
Typical coverage
89.1%
Individuals with a value
235.1M
Share in largest category
63.8%
Most values come
from the person
Latest collection
Jun 1, 2026

How the categories split

n = 235,088,585

Share of individuals in each category. 2 categories, with 63.8% in the largest.

since previous collection
Household Specific
63.8%−0.8 pts
Household Inferred
36.2%+0.8 pts
Distinct categories
2
Share in largest category
63.8%

Category shares over time

Household Specific63.8% (largest)

The 2 largest categories, each followed across 12 collections. Estimated from a 1% sample of individuals.

Jun 2024Mar 2025Jul 2025Nov 2025Feb 2026Jun 2026
Household SpecificHousehold Inferred

Coverage

Latest collection: 223,305,428 individuals

Coverage by state

Percentage of individuals in each state with a value.

Coverage over time

91.3% today

Share of individuals holding a value at each monthly snapshot. A value carries forward for one year.

Jul 23Jun 24Mar 25Jul 25Nov 25Feb 26Jun 26

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 91.3% sits on the catalog’s own coverage range.

catalog min 0%max 100%

Higher coverage than 44% 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.

Jun 1, 2026
latest collection
4 months 16 days
since the latest collection
every two months
new collection cadence
Jun 24Mar 25Jul 25Nov 25Feb 26May 26

Change between collections

The share of individuals whose category changed.

0.1%

of individuals changed value between the two most recent collections — 245.0× steadier than the catalog median of 16.0%.

Contribution ledger

14 ingestions

1 authority contributed since Jul 2023.

ObservedIngestedCountID
263,433,64974d6c94c-8e2b-48fe-a704-50c99ad3cdde
266,506,942c5492806-a892-460e-aba1-ee78ffb29c5b
264,096,9771181277b-b751-4a59-aae1-101fa3f55375
264,777,400af53c569-4fe2-4282-975b-4cbf5f85692d
268,508,09184d6a1c5-d142-4a4d-9cb3-902de4c82c30

Related attributes

Attributes whose descriptions are closest to this one.

Neighbors found Oct 2026.

Use it in the API

Send an email, phone, or address. Get Birthday day derivation back in real time.

  1. Add birthday_day_derivation to a project.
  2. Send an email, phone, or address to the project's append endpoint. The response carries Birthday day derivation for the matched person.
curl -X POST 'https://api.pro.faraday.ai/v1/projects/YOUR_PROJECT_ID/append' \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
      "email": "jane.doe@example.com"
    }'
→ {"attributes":{"birthday_day_derivation":"Household Specific"}}
Get it by APIAppend to a fileRead the API docs →

Technical details

API name
birthday_day_derivation
Category
fig/life_event
Type · unit
Text
Statistical type
nominal
Allowed values
null
Derivations
null
How values combine
Read from a single source field.
Directionality
null
Deprecation
false