Attachment8_Strata_and_Selection_Probabilities

Attachment 8
CHIS Geographic Strata and Selection Probabilities

RDD Sample: Geographic Strata and Selection Probabilities
Stratum ID
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

Stratum
Los Angeles
San Diego
Orange
Santa Clara
San Bernardino
Riverside
Alameda
Sacramento
Contra Costa
Fresno
San Francisco
Ventura
San Mateo
Kern
San Joaquin
Sonoma
Stanislaus
Santa Barbara
Solano
Tulare
Santa Cruz
Marin
San Luis Obispo
Placer
Merced
Butte
Shasta
Yolo
El Dorado
Imperial
Napa
Kings
Madera
Monterey
Humboldt
Nevada
Mendocino
Sutter
Yuba
Lake
San Benito
Tehama-Glenn-Colusa
Del Norte-Lassen-ModocPlumas-Sierra-Siskiyou-Trinity
Tuolumne-Calaveras-AmadorInyo-Mariposa-Mono-Alpine
Total

DOF 2009
HHs Est*
3,442,863
1,028,998
1,142,357
665,839
712,889
610,185
557,586
533,758
386,935
305,817
271,657
348,030
277,265
259,554
234,928
176,891
185,601
130,879
143,951
151,116
134,250
122,926
91,412
106,331
107,339
79,816
89,374
71,357
74,526
67,798
52,951
45,238
46,544
51,954
54,229
40,836
35,693
34,133
26,655
27,426
18,720
42,216

Prop Dist of
HHs
0.262
0.078
0.087
0.051
0.054
0.046
0.042
0.041
0.029
0.023
0.021
0.027
0.021
0.020
0.018
0.013
0.014
0.010
0.011
0.012
0.010
0.009
0.007
0.008
0.008
0.006
0.007
0.005
0.006
0.005
0.004
0.003
0.004
0.004
0.004
0.003
0.003
0.003
0.002
0.002
0.001
0.003

Adult
10,221
3,055
3,391
1,977
2,116
1,812
1,655
1,585
1,149
908
807
1,033
823
771
697
600
600
600
600
600
600
600
600
600
600
600
600
600
600
500
500
500
500
600
500
500
500
500
500
500
500
500

Adolescent
633
185
216
127
179
137
120
111
79
67
25
86
60
64
43
33
58
39
45
44
43
36
39
45
52
37
49
51
54
46
34
37
41
40
36
28
31
44
30
33
50
33

62,100

0.005

500

32

78,777

0.006

500

19

48,000

3,291

13,129,700

CHIS 2009 Preliminary RDD Sample Design
Approximate Design Effects for the CHIS 2009 Sample
The following table shows the approximate design effects for the CHIS 2009. The data source for adjusted
household and population counts is the California Department of Finance (DOF) 2009 population estimates. These
approximations do not reflect the oversampling of high density areas, and they use population counts rather than adult
counts. Further, they can only be produced for the groups found in the DOF files. In spite of these limitations, we
consider these estimates to be sufficiently valid for purposes of estimating design effect.
Table 1. Approximate design effect for the CHIS 2009 sample

Population
Total Adults
OMB White alone non-Hispanic
OMB African American alone non- Hispanic
OMB American Indian alone non- Hispanic
OMB Asian alone non- Hispanic
OMB Native Hawaiian or Pacific Islander non-Hispanic
OMB Multiple race non- Hispanic
Adult Hispanic

Nominal Sample Design Effect Effective Sample
48,000
26,813
2,576
347
4,564
114
951
12,635

1.15
1.16
1.04
1.25
1.05
1.10
1.16
1.11

41,891
23,097
2,472
278
4,362
104
819
11,342