The 2011 NWEA RIT Scale Norms Study provides growth and status norms... The study’s results are based on grade level (K-11) samples of at least 20,000 students per grade. These samples were randomly drawn from a test records pool of 5.1 million students, from over 13,000 schools in more than 2,700 school districts in 50 states. Rigorous post-stratification procedures were then used to maximize the degree to which both status and growth norms are representative of the U.S. school-age population.So, no, this test is not normed to the whole population. Note - legitimate ability assessments will provide sample and norming data. Now, you are right in that this data is not set in stone. The 2012 NWEA norms will look at up to 240,000 new kids, as will the 2013 norms...and so on.
The new Colorado evaluation system was developed in response to a 2010 bill requiring that all principals, teachers and other licensed school staff be reviewed annually. Half of a teacher’s score is determined by student achievement on a range of tests...All I am saying is where is the research that backs up the hypothesis that 50% of teacher effectiveness can be described by the assessment given. If such research exists it should be publicly available. If that research isn't publicly available, we should be suspicious of the results.
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posted by roomthreeseventeen at 8:32 AM on January 15 [1 favorite]