This determines the time difference between each test for a patient in days.
SurveilTimeByRow(dataframe, HospNum_Id, Endo_ResultPerformed)
dataframe | dataframe, |
---|---|
HospNum_Id | Patient ID |
Endo_ResultPerformed | Date of the Endoscopy |
aa<-SurveilTimeByRow(Myendo,'HospitalNumber', 'Dateofprocedure')