More on the SGP debate: A reply
This new post from Ed News Colorado is in response to my critique of Student Growth Percentiles here:http://schoolfinance101.wordpress.com/2011/09/02/take-your-sgp-and-vamit-damn-it/
I must say that I agree with almost everything in this response to my post, except for a few points. First, they argue:
Unfortunately Professor Baker conflates the data (i.e. the measure) with the use. A primary purpose in the development of the Colorado Growth Model (Student Growth Percentiles/SGPs) was to distinguish the measure from the use: To separate the description of student progress (the SGP) from the attribution of responsibility for that progress.
No, I do not conflate the data and measures with their proposed use. Policy makers are doing that and doing