June 12, 2007

New Swanson CPI numbers: still flawed

The new Ed Week graduation numbers are out, based on 2003 and 2004 Common Core of Data figures. Among the 50 largest district, the lowest Swanson CPI (cohort progression index) in the nation is still Detroit with 24.9%. And the CPI is still flawed, partly because it relies on the unaudited Common Core of Data figures. As I said almost a year ago, Detroit's figures make no sense (and please accept my apologies for the long scroll you'll have to make below to get to the table):

Detroit CPI calculations, 2000-2004
Measure 2000 2001 2002 2003 2004
9th grade enrollment 13,723 14,494 20,025 17,837 16,832
10th grade enrollment 8,860 9,291 11,275 9,899 9,326
11th grade enrollment 6,355 6,382 7,795 7,421 6,581
12th grade enrollment 5,329 4,618 6,020 5,244 5,604
Prior year grads 6,068 5,540 5,975 4,975
CPI 40.4% 73.9% 21.7% 24.9%

Source: Common Core of Data.

Is there any chance that Detroit's numbers can fluctuate so wildly? Garbage in, garbage out. 

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Posted in Research on June 12, 2007 12:06 PM |