cohort_collapse

cohort_collapse(x)

Collapse overlapping cohort periods per (cohort_definition_id, subject_id) into contiguous intervals.

Expects columns cohort_definition_id, subject_id, cohort_start_date, cohort_end_date. Orders by cohort_start_date and duration, then merges overlapping/adjacent periods.

Parameters

Name	Type	Description	Default
x	Ibis table or pandas DataFrame	Cohort-like table with required columns.	required

Returns

Name	Type	Description
	pandas.DataFrame	Collapsed cohort with columns cohort_definition_id, subject_id, cohort_start_date, cohort_end_date.