NAEP Assessment Sample Design → NAEP 2010 Sample Design → Selection of Primary Sampling Units (PSUs) for the 2010 Assessment → Primary Sampling Unit (PSU) Frame: Stratification for the 2010 Assessment → Final Primary Sampling Unit (PSU) Strata for the 2010 Assessment

Final Primary Sampling Unit (PSU) Strata for the 2010 Assessment

The strata were defined using the selected stratifiers from the stepwise regression analysis (see Stepwise Regression Analysis Results for PSU Stratification). The cutoffs were selected so that roughly equal measures of size were represented by each stratum.

NAEP Technical DocumentationStratification for Northeast metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
† Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010.
Total	†	†	46	4,588,413
1	Percent child poverty <=10.1%	Percent Black <=15.9%	8	579,823
2	Percent child poverty <=10.1%	15.9%< Percent Black <=27.7%	2	539,106
3	10.1%< Percent child poverty <=12.5%	Percent Black <=14.9%	7	583,822
4	10.1%< Percent child poverty <=12.5%	14.9%< Percent Black <=38.2%	4	629,042
5	12.5%< Percent child poverty <=13.4%	†	5	550,236
6	13.4%< Percent child poverty <=15.1%	†	7	583,454
7	15.1%< Percent child poverty <=17%	†	5	526,414
8	17%< Percent child poverty <=20.7%	†	8	596,516
Mean	†	†	†	573,552

Stratification for Northeast non-metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010

Stratum	Primary stratifier	PSUs	Measure of size
† Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010.
Total	†	50	1,119,775
1	Percent child poverty <=15.7%	23	574,630
2	15.7%< Percent child poverty <=22.8%	27	545,145
Mean	†	†	559,888

Stratification for Midwest metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010

Stratum	Primary stratifier	Secondary stratifier	Tertiary stratifier	PSUs	Measure of size
† Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010. Stratification for Midwest non-metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010 Stratum Primary stratifier Secondary stratifier Tertiary stratifier PSUs Measure of size † Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010. Total † † † 249 3,545,947 1 Percent child poverty <=15.7% Percent college grd <=12.5% † 41 586,555 2 Percent child poverty <=15.7% 12.5%< Percent college grd <=36.0% Pct BHI <=4.2% 42 586,221 3 Percent child poverty <=15.7% 12.5%< Percent college grd <=36.0% 4.2%< Pct BHI <=8.5% 42 589,813 4 Percent child poverty <=15.7% 12.5%< Percent college grd <=36.0% 8.5%< Pct BHI <=41.4% 38 598,574 5 15.7%< Percent child poverty <=45.5% Percent college grd <=13.2% † 41 592,139 6 15.7%< Percent child poverty <=45.5% 13.2%< Percent college grd <=23.0% † 45 592,645 Mean † † † † 590,991 Stratification for South metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010 Stratum Primary stratifier Secondary stratifier Tertiary stratifier PSUs Measure of size † Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010. Total † † † 153 13,166,582 1 Percent child poverty <=22.7% Percent Black <=39.7% Percent Hispanic <=1.7% 16 566,975 2 Percent child poverty <=22.7% Percent Black <=39.7% 1.7%< Percent Hispanic <=2.6% 12 657,266 3 Percent child poverty <=22.7% Percent Black <=39.7% 2.6%< Percent Hispanic <=2.7% 3 574,958 4 Percent child poverty <=22.7% Percent Black <=39.7% 2.7%< Percent Hispanic <=3.0% 8 566,272 5 Percent child poverty <=22.7% Percent Black <=39.7% 3.0%< Percent Hispanic <=3.5% 7 605,893 6 Percent child poverty <=22.7% Percent Black <=39.7% 3.5%< Percent Hispanic <=4.2% 6 712,048 7 Percent child poverty <=22.7% Percent Black <=39.7% 4.2%< Percent Hispanic <=4.8% 4 616,585 8 Percent child poverty <=22.7% Percent Black <=39.7% 4.8%< Percent Hispanic <=5.5% 6 518,021 9 Percent child poverty <=22.7% Percent Black <=39.7% 5.5%< Percent Hispanic <=7.3% 8 591,448 10 Percent child poverty <=22.7% Percent Black <=39.7% 7.3%< Percent Hispanic <=8.5% 5 529,429 11 Percent child poverty <=22.7% Percent Black <=39.7% 8.5%< Percent Hispanic <=9.1% 4 732,120 12 Percent child poverty <=22.7% Percent Black <=39.7% 9.1%< Percent Hispanic <=11.2% 6 646,351 13 Percent child poverty <=22.7% Percent Black <=39.7% 11.2%< Percent Hispanic <=14.6% 8 570,802 14 Percent child poverty <=22.7% Percent Black <=39.7% 14.6%< Percent Hispanic <=21.1% 6 545,019 15 Percent child poverty <=22.7% Percent Black <=39.7% 21.1%< Percent Hispanic <=30.8% 6 744,077 16 Percent child poverty <=22.7% Percent Black <=39.7% 30.8%< Percent Hispanic <=51.2% 6 639,519 17 Percent child poverty <=22.7% 39.7%< Percent Black <=56.6% Percent Hispanic <=2.7% 6 548,188 18 Percent child poverty <=22.7% 39.7%< Percent Black <=56.6% 2.7%< Percent Hispanic <=7.8% 6 659,111 19 22.7%< Percent child poverty <=24.3% † † 11 497,879 20 24.3%< Percent child poverty <=45.7% Percent Black <=2.0% † 4 703,249 21 24.3%< Percent child poverty <=45.7% 2.0%< Percent Black <=60.8% Percent Hispanic <=3.8% 11 528,883 22 24.3%< Percent child poverty <=45.7% 2.0%< Percent Black <=60.8% 3.8%< Percent Hispanic <=64.1% 4 412,489 Mean † † † † 598,481 Stratification for South non-metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010 Stratum Primary stratifier Secondary stratifier Tertiary stratifier PSUs Measure of size † Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010. Total † † † 269 5,212,564 1 Percent Black <=31.2% Median HH income <=$36,049 Percent Asian <=0.2% 32 514,059 2 Percent Black <=31.2% Median HH income <=$36,049 0.2%< Percent Asian <0.3% 29 517,340 3 Percent Black <=31.2% Median HH income <=$36,049 Percent Asian =0.3% 32 521,081 4 Percent Black <=31.2% Median HH income <=$36,049 0.3%< Percent Asian <=0.4% 29 513,297 5 Percent Black <=31.2% Median HH income <=$36,049 0.4%< Percent Asian <=0.7% 26 535,410 6 Percent Black <=31.2% Median HH income <=$36,049 0.7%< Percent Asian <=3.0% 26 541,800 7 Percent Black <=31.2% $36,049< Median HH income <=$54,721 † 21 550,471 8 31.2%< Percent Black <=51.3% Median HH income <=$29,555 † 25 517,561 9 31.2%< Percent Black <=51.3% $29,555< Median HH income <=$44,421 † 23 519,749 10 51.3%< Percent Black <=79.4% † † 26 481,796 Mean † † † † 521,256 Stratification for West metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010 Stratum Primary stratifier Secondary stratifier PSUs Measure of size † Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010. Total † † 71 6,727,668 1 Percent high school graduates <=70% Percent college graduates <=13.5% 7 632,663 2 Percent high school graduates <=70% 13.5%< Percent college graduates <=22.5% 4 506,364 3 70%< Percent high school graduates <=78.9% † 6 514,468 4 78.9%< Percent high school graduates <=79.6% † 3 647,067 5 79.6%< Percent high school graduates <=88.3% Percent college graduates <=21.8% 14 557,657 6 79.6%< Percent high school graduates <=88.3% 21.8%< Percent college graduates <=25.5% 8 581,351 7 79.6%< Percent high school graduates <=88.3% 25.5%< Percent college graduates <=26.9% 4 518,626 8 79.6%< Percent high school graduates <=88.3% 26.9%< Percent college graduates <=27.8% 3 575,472 9 79.6%< Percent high school graduates <=88.3% 27.8%< Percent college graduates <=30.3% 3 553,395 10 79.6%< Percent high school graduates <=88.3% 30.3%< Percent college graduates <=39.5% 3 520,151 11 88.3%< Percent high school graduates <=90.1% † 8 549,442 12 90.1%< Percent high school graduates <=93.1% † 8 571,012 Mean † † † 560,639
Total	†	†	†	100	7,469,915
1	Percent child poverty <=12.5%	†	Pct Asian <=1.1%	17	626,631
2	Percent child poverty <=12.5%	†	1.1%< Pct Asian <=1.4%	4	663,857
3	Percent child poverty <=12.5%	†	1.4%< Pct Asian <=2.4%	8	598,408
4	Percent child poverty <=12.5%	†	2.4%< Pct Asian <=2.6%	3	700,908
5	Percent child poverty <=12.5%	†	2.6%< Pct Asian <=3.4%	7	600,040
6	Percent child poverty <=12.5%	†	3.4%< Pct Asian <=10.3%	13	616,885
7	12.5%< Percent child poverty <=12.9%	†	†	6	620,982
8	12.9%< Percent child poverty <=14.5%	†	Pct Asian <=1.3%	7	625,099
9	12.9%< Percent child poverty <=14.5%	†	1.3%< Pct Asian <=2.7%	7	605,932
10	14.5%< Percent child poverty <=27.6%	Med HH Income <=$38,291	†	17	606,238
11	14.5%< Percent child poverty <=27.6%	$38,291< Med HH Income <=$46,460	Pct Asian <=0.9%	7	577,510
12	14.5%< Percent child poverty <=27.6%	$38,291< Med HH Income <=$46,460	0.9%< Pct Asian <=3.1%	4	627,425
Mean	†	†	†	†	622,493

Stratification for West non-metropolitan noncertainty primary sampling units (PSUs), by stratum: 2010

Stratum	Primary stratifier	Secondary stratifier	Tertiary stratifier	PSUs	Measure of Size
† Not applicable. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2010.
Total	†	†	†	102	1,677,259
1	Percent college graduates <=21%	Percent child poverty <=17.3%	†	26	425,942
2	Percent college graduates <=21%	17.3%<Percent child poverty <=43%	Percent HS graduates <=77.3%	23	410,446
3	Percent college graduates <=21%	17.3%<Percent child poverty <=43%	77.3%< Percent HS graduates <=86.4%	28	411,675
4	21%< Percent college graduates <=42.6%	†	†	25	429,196
Mean	†	†	†	†	419,315

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