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NAEP Sample Design → NAEP 2004 Long-Term Trend Sample Design → Long-Term Trend Sampling of Primary Sampling Units → Primary Sampling Unit Frame: Stratification → Final Primary Sampling Unit Strata

NAEP Technical DocumentationFinal Primary Sampling Unit Strata

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

Stratification for Northeast NAEP region metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	40	4,934,000
1	Percent Black <= 5.6%	Child poverty <= 13.2%	11	817,000
2	Percent Black <= 5.6%	Child poverty > 13.2%	13	826,000
3	5.6% < Percent Black <= 11.0%	†	8	884,000
4	11.0% < Percent Black <= 12%	†	2	803,000
5	12.0% < Percent Black <= 14.0%	†	2	710,000
6	14.0% < Percent Black	†	4	894,000
Mean	†	†	†	822,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

Stratification for Northeast NAEP region non metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	60	1,468,000
1	Child poverty <= 15.0%	†	29	739,000
2	Child poverty > 15.0%	†	31	730,000
Mean	†	†	†	734,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

Stratification for Southeast NAEP region metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	103	10,237,000
1	Child poverty <= 11.6%	†	4	720,000
2	11.6% < Cld pov <= 15.1%	Pct Black <= 17.5%	10	738,000
3	11.6% < Cld pov <= 15.1%	17.5% < Pct Blk <= 20.0%	2	713,000
4	11.6% < Cld pov <= 15.1%	20.0% < Pct Blk <= 23.7%	5	645,000
5	11.6% < Cld pov <= 15.1%	23.7% < Pct Blk <= 26.0%	2	638,000
6	11.6% < Cld pov <= 15.1%	Pct Black > 26.0%	3	826,000
7	15.1% < Cld pov <= 17.5%	Pct Black <=18.0%	10	981,000
8	15.1% < Cld pov <= 17.5%	18.0% < Pct Blk <= 33.0%	7	591,000
9	15.1% < Cld pov <= 17.5%	Pct Black > 33.0%	3	628,000
10	17.5% < Cld pov <= 20.3%	Pct Black <= 34.0%	15	749,000
11	17.5% < Cld pov <= 20.3%	Pct Black > 34.0%	8	772,000
12	20.3% < Cld pov <= 25.0%	Pct Black <=44.2%	15	729,000
13	20.3% < Cld pov <= 25.0%	Pct Black > 44.2%	8	731,000
14	25.0% < Child poverty	†	11	775,000
Mean	†	†	†	731,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

Stratification for Southeast NAEP region non metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	223	4,826,000
1	Percent Black <= 2.65%	†	42	807,000
2	2.65% < Percent Black <= 7.46%	†	36	783,000
3	7.46% < Percent Black <= 21.0%	†	34	809,000
4	21.0% < Percent Black <= 36.6%	†	37	818,000
5	36.6% < Percent Black <= 47.5%	†	37	812,000
6	47.5% < Percent Black	†	37	798,000
Mean	†	†	†	804,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

Stratification for Central NAEP region metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	82	8,669,000
1	Child poverty <= 9.65%	Pct Asian <= 4.05%	15	851,000
2	Child poverty <= 9.65%	Pct Asian > 4.05%	5	922,000
3	9.65% < Cld pov <= 12.15%	Pct Asian <= 1.5%	8	936,000
4	9.65% < Cld pov <= 12.15%	Pct Asian > 1.5%	7	792,000
5	12.15% < Cld pov <= 16.2%	Pct cllg graduates <= 21.5%	15	757,000
6	12.15% < Cld pov <= 16.2%	21.5% < Pct cllg grds <= 23.4%	6	781,000
7	12.15% < Cld pov <= 16.2%	23.4% < Pct cllg grds <= 26.05%	5	910,000
8	12.15% < Cld pov <= 16.2%	26.05% < Pct cllg grds <= 26.5%	2	857,000
9	12.15% < Cld pov <= 16.2%	Pct cllg graduates > 26.5%	8	1,117,000
10	16.2% < Child poverty	†	11	747,000
Mean	†	†	†	867,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

Stratification for Central NAEP region non metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	281	4,285,000
1	Child poverty <= 9.1%	†	45	705,000
2	9.1% < Cld pov <= 12.7%	Med hh income <= $38,000	51	718,000
3	9.1% < Cld pov <= 12.7%	Med hh income > $38,000	44	713,000
4	12.7% < Cld pov <= 18.0%	Med hh income <=$34,850	49	705,000
5	12.7% < Cld pov <= 18.0%	Med hh income > $34,850	40	712,000
6	18.0% < Child poverty	†	52	732,000
Mean	†	†	†	714,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

Stratification for West NAEP region metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	74	9,248,000
1	Percent renters <= 34.0%	Pct college graduates <= 18.3%	12	754,000
2	Percent renters <= 34.0%	18.3% < Pct cllg grads <= 26.0%	13	778,000
3	Percent renters <= 34.0%	26.0% < Pct cllg grads <= 33.0%	4	764,000
4	Percent renters <= 34.0%	Pct college graduates > 33.0%	3	758,000
5	34.0% < Pct rntrs <= 38.7%	Pct college graduates <= 17.0%	6	833,000
6	34.0% < Pct rntrs <= 38.7%	17.0% < Pct cllg grads <= 23.2%	7	737,000
7	34.0% < Pct rntrs <= 38.7%	23.2% < Pct cllg grads <= 27.0%	5	720,000
8	34.0% < Pct rntrs <= 38.7%	Pct college graduates > 27.0%	5	722,000
9	38.7% < Pct rntrs <= 40.3%	Pct college graduates <= 22.0%	5	672,000
10	38.7% < Pct rntrs <= 40.3%	Pct college graduates > 22.0%	3	880,000
11	40.3% < Pct rntrs <= 44.5%	†	8	758,000
12	44.5% < Percent renters	†	3	870,000
Mean	†	†	†	771,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

Stratification for West NAEP region non metropolitan noncertainty PSUs: By stratum, 2004

Stratum	Primary stratifier	Secondary stratifier	PSUs	Measure of size
Total	†	†	202	3,448,000
1	Child poverty <=15.8%	†	46	862,000
2	15.8% < Child poverty <= 21.0%	†	53	860,000
3	21.0% < Child poverty <= 24.83%	†	54	860,000
4	24.83% < Child poverty	†	49	867,000
Mean	†	†	†	862,000
† Not applicable. NOTE: Measures of size are rounded to the nearest thousand. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2004.

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