From my googling I found that only about 30% of the universities I looked at (in Computer Science) offer Research Assistant (RA)/Teaching Assistant (TA) positions to Master's students that cover tuition (i.e. USC, UMich). Is this normal, or did I miss something? I thought it was standard but a lot of universities like UChicago, Northwestern do not cover tuition for TA/RAs.
Side question: is the answer to this different across areas of study and departments or is tuition coverage for Masters RAs/TAs determined across the whole university?