I interpret this as saying the Lexile is linked to nationally normed tests but is not a nationally normed test in itself.
Does that help?
I believe so. I guess that my confusion lies in that dd took a MAPS reading test in 4th grade that, like you mentioned, linked to a lexile and gave us a lexile. She also took a straight SRI Lexile test in 2nd grade (the same test she took this year) and the district gave us a print out with a national norm of 99th percentile, so I assumed that the SRI lexile test, in and of itself, had normative data not just the tests with which it is correlated.
I guess that I'll just wait and see what scores we have by the start of next fall to see what we can use. It just seems that in middle school very few, if any, tests are given that give national norms -- at least at dd's school.