MAKING IT USEABLE    Interpreting Estimates       The NPTS Sample Strata

The following table shows the strata making up the original 1995 NPTS National Sample but does not reflect the impact of the later addition of add-on areas:

Table 7
Design for the 1995 NPTS National Sample

Strata	Census Division	Metropolitan Population Status	Availability of Elevated Rail or Subway	Number of Sample Households
1	New England	1,000,000 or more	Absent	192
2	New England	1,000,000 or more	Present	463
3	New England	less than 1,000,000	Absent	505
4	New England	Non-Metropolitan	Absent	192
5	Middle Atlantic	1,000,000 or more	Absent	924
6	Middle Atlantic	1,000,000 or more	Present	1,959
7	Middle Atlantic	less than 1,000,000	Absent	794
8	Middle Atlantic	Non-Metropolitan	Absent	303
9	East North Central	1,000,000 or more	Absent	920
10	East North Central	1,000,000 or more	Present	1,084
11	East North Central	less than 1,000,000	Absent	1,411
12	East North Central	Non-Metropolitan	Absent	810
13	West North Central	1,000,000 or more	Absent	586
14	West North Central	less than 1,000,000	Absent	423
15	West North Central	Non-Metropolitan	Absent	704
16	South Atlantic	1,000,000 or more	Absent	977
17	South Atlantic	1,000,000 or more	Present	1,420
18	South Atlantic	less than 1,000,000	Absent	1,366
19	South Atlantic	Non-Metropolitan	Absent	878
20	East South Central	1,000,000 or more	Absent	188
21	East South Central	less than 1,000,000	Absent	641
22	East South Central	Non-Metropolitan	Absent	617
23	West South Central	1,000,000 or more	Absent	951
24	West South Central	less than 1,000,000	Absent	946
25	West South Central	Non-Metropolitan	Absent	594
26	Mountain	1,000,000 or more	Absent	489
27	Mountain	less than 1,000,000	Absent	472
28	Mountain	Non-Metropolitan	Absent	375
29	Pacific	1,000,000 or more	Absent	1,874
30	Pacific	1,000,000 or more	Present	731
31	Pacific	less than 1,000,000	Absent	894
32	Pacific	Non-Metropolitan	Absent	316
Total				25,000

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