matchdb groups EINs into typed clusters, an EIN may sit in several:
group_exemption (an IRS group ruling), related_system (Schedule R),
care_of_network (a shared in-care-of organisation), shared_website,
brand (a dominant shared name, such as a federation's chapters) and
co_tenant (a shared street address). md_cluster() lists an EIN's
clusters and their members, each with its best legal name, layer and state.
Arguments
- ein
An EIN whose clusters to show. Give this or
cluster_id.- cluster_id
One or more cluster ids.
- types
Cluster types to keep;
NULLfor all.- max_members
The most members listed per cluster. A brand cluster can hold 25,000;
sizealways reports the full count.- con
A connection from
md_db(); opened read-only and closed whenNULL.