Assume a three column dataset with Patient ID, Smoking Status and Review Date PatientID SmokingStatus ReviewDate P1 10-03-2018 P1 9 09-03-2018 P1 1 08-03-2018 P1 4 07-03-2018 P2 9 10-03-2018 P2 9 09-03-2018 P2 9 08-03-2018 P2 9 07-03-2018 P3 2 10-03-2018 P3 09-03-2018 P3 9 08-03-2018 P4 9 10-03-2018 P4 1 09-03-2018 P4 4 […]
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Determine the most recent status after satisfying certain conditions
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