I tried searching the forum to see if this question has been asked before, but didn't see it.
I took the PGRE last year (nov 2007), received my score and percentile rank that next month, as per usual.
I re-reported my scores this year (in the last month), to apply to grad school, and my score is the same, but percentile rank is lower. I thought I remembered being told that your percentile rank comes from people that take the _same_ test (i.e. nov 2007), and will not change.
Upon calling ETS, a representative said that it can change as time goes on, since test takers from different dates are compared continually. Has this happened to anyone else? Is this common? If it is, it's a drag, because my rank went down and not up (and I was pretty dissapointed with where I was to begin with).