Extract the time difference between each test in days

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')