Do all 100 schools in the same similar schools rank (the comparison group) have the same demographic characteristics?
Each school is unique; therefore, it is impossible to find similar schools that match in every way. In order to form large enough groups of similar schools for meaningful ranks, the procedure used for each SCI allows for some differences between schools. Does the comparison group for a school remain the same from year to year? No. Demographic characteristics change from year to year. In March 2006, schools received a 2005 similar schools rank, which compared the schools 2005 API level to a group of 100 similar schools. In March 2007, schools will receive a 2006 similar schools rank which will compare their 2006 API level to a new group of 100 similar schools. The new group of 100 similar schools may or may not change substantially from the previous year. Another school in the school district has similar students and almost exactly the same API score but a different “similar schools” rank. How can that be? The SCIs are calculated using many demographic characteristics. Even if schools a
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