data mining

Objective

Select like-minded users from a local community website.

Pre-requisites

1. A Drupal website with the votingapi module enabled and at least a few dozen votes by registered users.
2. A working installation of the R language.

Exract data

For each user, select all other users that voted on same node and comments:

SELECT v1.uid uid1, v2.uid uid2, u1.name name1, u2.name name2,
  v2.entity_id entity_id, v1.value value1, v2.value value2
FROM votingapi_vote v1
JOIN (votingapi_vote v2, users u1, users u2)
 ON (v1.uid != v2.uid AND v1.entity_id=v2.entity_id
   AND v1.entity_type=v2.entity_type AND v1.uid=u1.uid AND v2.uid=u2.uid)
WHERE v1.uid 

This produces a table