how to code a vaccination why can't you leave vaccines blank when a person is not vaccinated how to code vaccination status when do you code an immunotiter why would vaccine status be left blank when do you leave cells blank if not vaccinated why do you leave blank cells on vaccination status which statement would be the correct way to code a single variable in the spss rna data set? which of the following is an independent variable? what is the difference between vaccination status and antibody titer assessment what is the purpose of an independent variable in spss why can't i leave blank cells on vaccine status when should a tier check be blank how to code tier check in excel do you code a vaccine as 0 if there is no vaccine if someone is non vaccination, should they leave them blank why leave cells blank for vaccine status which variable should be capitalized when vaccine positive when does titer change for vaccination why do I leave the cells of vaccine status blank in sps