Well, I haven't actually lived in TX in 11 years... while I was on active duty my residency status was clearly TX, but I separated 6 months ago. Most full-time students are dependents on their parents' tax returns, and therefore clearly have derivative residency status, but I haven't been a dependent for years.
I claim that full-time-student status in MA doesn't make me a MA resident, but there's no official policy stating that. Baylor has one process and the UT schools have another, so I have two chances to be deemed sufficiently Texan. Still have voter registration & drivers license there, bank accounts, tax returns, etc...
I'm damned sure not from Massachusetts!