TABLE F-2 Average Differences Between ACS 3-Year Estimates and 3-Year Averages of CCD Estimates

  Large and Medium Districts
Estimand 2005-2007 2006-2008 2007-2009
Very High FRPL Districts (327) (333) (329)
 Percentage free –17.1 –17.6 –17.6
 Percentage reduced price 3.5 2.9 3.2
 Percentage free or reduced price –13.6 –14.7 –14.4
 BRR, $ –0.33 –0.35 –0.35
High FRPL Districts (918) (964) (962)
 Percentage free –7.5 –8.7 –9.5
 Percentage reduced price 1.9 1.7 1.9
 Percentage free or reduced price –5.6 –7.0 –7.6
 BRR, $ –0.14 –0.17 –0.19
Low to Moderate FRPL Districts (830) (916) (973)
 Percentage free –2.8 –3.5 –4.1
 Percentage reduced price 1.6 1.3 1.3
 Percentage free or reduced price –1.2 –2.2 –2.9
 BRR, $ –0.03 –0.06 –0.07

NOTES: The ACS 3-year estimates are compared with 3-year averages of CCD estimates. For example, the ACS estimates for 2005-2007 are compared with the average of CCD estimates for 2005-2006, 2006-2007, and 2007-2008. ACS = American Community Survey; BRR = blended reimbursement rate; CCD = Common Core of Data; FPRL = free or reduced-price lunch.
SOURCE: Prepared by the panel.

multiyear average estimates computed over the same time periods as the ACS estimates, as well as the differences between the ACS multiyear estimates and the CCD estimates for the most recent school year that overlaps the ACS reference period. (For the latter, the ACS estimate for 2005-2009 is compared with the CCD estimate for 2009-2010, and the ACS estimate for 2007-2009 is also compared with the CCD estimate for 2009-2010.)

In addition to sampling error in the ACS estimates and various other errors in both the ACS and administrative estimates, enrollment estimates may differ because school district boundaries are different in different years. All of the ACS estimates are based on the school district boundaries recorded in the Census Bureau’s Topologically Integrated Geographic Encoding and Referencing (TIGER) database for 2009-2010 and data reflecting the number of students that resided within those boundaries at some time during a calendar year. On the other hand, the CCD data reflect the district’s enrollment as of October of a school year based on the boundaries for that year. School choice is another reason why enrollment estimates may differ. Children who live in the catchment area of a school

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