Hi! I have two questions.   Question 1: I have a data set (that I imported as a csv from Excel) with prevalence data of 50 diseases. I only want to analyze 30 of these diseases, so I am trying to exclude/delete the observations with other 20. The variable is Disease and I have tried the following example:   data SelectedDiseases; set AllDiseases; if Disease = 'Zika Virus Infection' OR Disease = 'Malaria' OR Disease = "Flavivirus Infection of Unknown Species' THEN DELETE; run;   I am wondering if the spaces are the problem?   Question 2: Once I figure out how to get my SelectedDiseases data subset, how do I store this in a library that is not the "work" library so that I do not have to delete the other diseases everyone I open SAS?   Thank you so much! ... View more