====== CIRCE ======

CIRCE - Cohort Inclusion and Restriction Criteria Expression

===== Introduction =====

When performing an analysis, usually the first step is to define the population of interest (also known as a cohort).  However, there is limited technology out there that makes it easy for a user to define populations based on user-specified criteria.  CIRCE provides a user interface for users to enter cohort criteria, persist them to storage, and generate the CDM v5 SQL queries.

==== Scope and purpose ====

The scope of CIRCE is to enable a researcher to specify criteria that identifies a patient population within the Common Data Model (CDM).  The criteria available for cohort definition is directly mapped to the entity types found in the CDM v5: Person, Condition_occurrence, Condition_era, Drug_Occurrence, Drug_era, Procedure_occurrence, Observation, Visit, and Death.  By having a well-defined data-structure for capturing cohort definition criteria, definitions can be shared between CDM environments to do comparative analysis.

===== Installation and support =====

=== Requirements ===

  *Ensure that you have OHDSI Web API service installed in your environment. see https://github.com/OHDSI/WebAPI

All source code and installation instructions available on Github: https://github.com/OHDSI/Circe

Any bugs/issues/enhancements should be posted to the Github repository: https://github.com/OHDSI/Circe/issues

Any questions/comments/feedback/discussion about HERMES can be posted on the OHDSI Developer Forum:  http://forums.ohdsi.org/c/developers


===== User Guide =====



==== Screenshots ====