TABLE F-1 Average Differences Between ACS 5-Year Estimates and 5-Year Averages of CCD Estimates

Estimand All Districts Large Districts Medium Districts Small Districts
Very High FRPL Districts (1,435) (113) (207) (1,115)
 Percentage free –17.7 –15.2 –17.3 –18.0
 Percentage reduced price 3.2 3.6 4.1 3.0
 Percentage free or reduced price –14.5 –11.7 –13.2 –15.0
 BRR, $ –0.35 –0.29 –0.32 –0.36
         
High FRPL Districts (3,782) (280) (628) (2,874)
 Percentage free –6.5 –8.8 –7.3 –6.2
 Percentage reduced price 1.9 2.2 2.3 1.8
 Percentage free or reduced price –4.7 –6.6 –5.0 –4.4
 BRR, $ –0.12 –0.16 –0.13 –0.11
         
Low to Moderate FRPL Districts (3,634) (263) (553) (2,818)
 Percentage free –1.4 –3.7 –2.9 –9.4
 Percentage reduced price 2.3 2.0 1.9 2.4
 Percentage free or reduced price 0.8 –1.7 –1.0 1.4
 BRR, $ 0.01 –0.05 –0.03 0.02

NOTES: The ACS 5-year estimates (for 2005-2009) are compared with the average of CCD estimates for 2005-2006, 2006-2007, 2007-2008, 2008-2009, and 2009-2010. ACS = American Community Survey; BRR = blended reimbursement rate; CCD = Common Core of Data; FPRL = free or reduced-price lunch.
SOURCE: Prepared by the panel.

The purpose of this comparison is to illustrate the differences that exist when the reference periods of the ACS and administrative estimates are as similar as possible. These tables display the same patterns as those observed in Chapter 4, where the administrative estimates pertain to the most recent year of the reference period for the ACS estimates. Namely, the ACS understates percentage free, percentage free or reduced price, and the BRR and overstates percentage reduced price. The differences are substantial in very high FRPL districts and are least pronounced in low to moderate FRPL districts; high FRPL districts fall in between. Over all districts, the BRR is understated by the 5-year ACS by 35 cents for very high FRPL districts and 12 cents for high FRPL districts, and is overstated by 1 cent in low to moderate FRPL districts.

Chapter 4 highlights the systematic differences between ACS and CCD estimates for eligibility percentages and the BRR. The following tables compare enrollment estimates from the two sources. Tables F-3 and F-4 illustrate the differences between ACS multiyear estimates and CCD



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