I’m using 2017 ACS data for a mix of variables, including HCOVANY, CITIZEN, EDUC, and many others. In all of the variables in my dataset, I have no missing values showing in Stata. Ostensibly this is a good thing, but I am afraid I am missing something (no pun intended). I am an undergraduate student in the midst of my first deep-dive into national data for a research program, so I am not extremely familiar with how missing data works in IPUMS. Could anyone offer some beginner-friendly help?