| cohort | R Documentation | 
Function that creates a cohort object
cohort(entry, attrition = NULL, exit = NULL, era = NULL)
| entry | the index event of the cohort | 
| attrition | rules that restrict the cohort further, developing attrition | 
| exit | the event where the person exits the cohort | 
| era | Cohort era (collapse) logic created with the 'cohortEra' function | 
an S4 Cohort class object describing the cohort definiton
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