This determines the time difference between each test for a patient in days.

SurveilTimeByRow(dataframe, HospNum_Id, Endo_ResultPerformed)

Arguments

dataframe

dataframe,

HospNum_Id

Patient ID

Endo_ResultPerformed

Date of the Endoscopy

Examples

aa<-SurveilTimeByRow(Myendo,'HospitalNumber', 'Dateofprocedure')