Usually not. I'd tend to believe you might go up/down by not more than 10 percentage points. But there are always exceptions ..
nate,I don't see how I couldn't at least consider transfering. I couldn't happier with my professors, the administration, etc. On the other hand, my wife is attending graduate school too; her program is unranked and doesn't even offer her desired concentration. Unlike me, she got into top 10 schools, so I have felt guilty for subjecting her to a sub-par acedemic experience.I will have to weigh all the options and make the final decision after next semester.