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--- documentation:cdm:concept_ancestor [2014/11/15 03:16]
cgreich created
+++ documentation:cdm:concept_ancestor [2017/10/02 19:31]
aostropolets
@@ Line 1: / Line 1: @@
 ===== CONCEPT_ANCESTOR table =====
+**THIS IS OUTDATED. All documentation is now on the [[https://github.com/OHDSI/CommonDataModel/wiki|github wiki]]. Please refer there or to the [[projects:workgroups:cdm-wg|CDM working group]] for more information**
-The CONCEPT_ANCESTOR table is designed to simplify observational analysis by providing the complete hierarchical relationships between Concepts. Only direct parent-child relationships between Concepts are stored in the CONCEPT_RELATIONSHIP table. To determine higher level ancestry connections, all individual direct relationships would have to be navigated at analysis time. The concept ancestor table includes records for all parent-child relationships, as well as grandparent-grandchild relationships and those of any other level of lineage. Using the CONCEPT_ANCESTOR table allows for querying for all descendants of a hierarchical concept. For example, drug ingredients and drug products are all descendants of a drug class ancestor.
+The CONCEPT_ANCESTOR table is designed to simplify observational analysis by providing the complete hierarchical relationships between Concepts. Only direct parent-child relationships between Concepts are stored in the CONCEPT_RELATIONSHIP table. To determine higher level ancestry connections, all individual direct relationships would have to be navigated at analysis time. The  CONCEPT_ANCESTOR table includes records for all parent-child relationships, as well as grandparent-grandchild relationships and those of any other level of lineage. Using the CONCEPT_ANCESTOR table allows for querying for all descendants of a hierarchical concept. For example, drug ingredients and drug products are all descendants of a drug class ancestor.
 This table is entirely derived from the CONCEPT, CONCEPT_RELATIONSHIP and RELATIONSHIP tables.
@@ Line 10: / Line 11: @@
 |min_levels_of_separation|Yes|integer|The minimum separation in number of levels of hierarchy between ancestor and descendant concepts. This is an attribute that is used to simplify hierarchic analysis.|
 |max_levels_of_separation|Yes|integer|The maximum separation in number of levels of hierarchy between ancestor and descendant concepts. This is an attribute that is used to simplify hierarchic analysis.|
+A path between two concepts can be characterized by the sequence of relationships that need to be traversed in order to reach a descendant concept from an ancestor concept.
+For example, for concepts
+^descendant_concept_id^descendant_concept_name^ancestor_concept_id^ancestor_concept_name^min_levels_of_separation^max_levels_of_separation^
+|4047584|Lengthening of extraocular muscle|4301351|Surgical procedure|3|6|
+the shortest path in concept_relationship will be :
+4047584 Lengthening of extraocular muscle **Is a** 4214521 Strabismus **Is a**
+4132804 Surgical procedure for clinical finding and/or disorder **Is a** 4301351Surgical procedure
+the longest:
+4047584 Lengthening of extraocular muscle **Is a** 4214521 Strabismus surgery **Is a**
+4070457 Operation on extraocular muscle **Is a** 4333146 Surgical procedure on orbit **Is a**
+4154279 Surgical procedure on eye region **Is a**  4233946 Operative procedure on head **Is a**
+4301351 Surgical procedure
 ==== Conventions ====

Observational Health Data Sciences and Informatics

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