rdpapworth

-- Continuous Inpatient Stay (CIS) is an identifier for an unbroken period of time that
-- a patient spends as an inpatient. A patient may change consultant, significant 
-- facility, speciality and/or hospital during a continuous inpatient stay. CIS can
-- be provided with Scottish SMR datasets. However, there are various rules associated
-- with CIS assignment that don't always map to study requirements (or are not 
-- implemented correct - especially with older SMR records). The code below assigns
-- a naive CIS to an SMR dataset. That is, a given CIS will be assigned to contiguous
-- records based soley on date. No consideration is given to origin of record or type
-- of admission.