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added an example for concept_ancestor

Anna Ostropolets 2017-10-03 00:36:31 +03:00
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StandardizedVocabularies/CONCEPT_ANCESTOR.md

@ -9,6 +9,31 @@ Field|Required|Type|Description
|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
:----------|:--------------------|:--------|:---------------------|:----------|:-----------
|313217|Atrial fibrillation|321588|Heart disease|3|4|
the shortest path in concept_relationship will be :
313217 Atrial fibrillation **Is a** 4226399 Fibrillation **Is a**
44784217 Cardiac arrhythmia **Is a** 321588 Heart disease
the longest:
313217 Atrial fibrillation **Is a** 4068155 Atrial arrhythmia **Is a**
4248028 Supraventricular arrhythmia **Is a** 44784217 Cardiac arrhythmia
**Is a** 321588 Heart disease
![](http://www.ohdsi.org/web/wiki/lib/exe/fetch.php?cache=&media=documentation:cdm:concept_ancestor.png)
### Conventions
* Each concept is also recorded as an ancestor of itself.