NWEA's answer seems to be yes but I'm not entirely convinced. DD's RIT score was lower when she took the standard MAP in the fall than it had been the previous spring on the P-MAP. I think it was more of a difference between the tests than a "summer slump."
http://www.nwea.org/support/article/1261When using the new norms, please keep in mind that MAP for Primary Grades represents downward extensions of the NWEA RIT scales in Reading and Mathematics. That is, the RIT scores reported from MAP for Primary Grades tests are on the same scales and are aligned with the RIT scores reported from standard NWEA MAP scores. [The Reading and Mathematics tests belong to the same underlying scales, but the MAP for Primary Grades tests allow student status to be estimated as early as the beginning of kindergarten, while the earliest standard MAP tests can commonly be used is beginning of grade 2.]
