Sampling Information for 1991-1992
The Chicago Collar Counties include Suburban Cook , Dupage, Kane, Lake, McHenry, and Will
Random Digit Dialing of telephone numbers in the 708 area code was used to construct the sample.  Exchanges were sampled in proportion to county population figures; and the completed survey contains respondents from the six counties in approximate proportions to the 1990 county population figures.
Table 1
1991 Chicago Collar County Survey
Random Digit Dialing Sampling Results
1.  Total Numbers Contacted                                                                        1,124
        1.1  Ineligible Numbers                                                                             101
2.  Eligible Households                                                                                   1,023
        1.1  No answer/ Respondent unavailable                                                    139
        2.2  Household Eligible and Contacted                                                       884
3.  Refusals                                                                                                        544
4.  Completions                                                                                                  330
5.  Completion rate/Eligible Households(340/1,023)                                          33.2%
6.  Completion rate/Contacted Households(340/884)                                        38.5%
                                                      Table 2
1991 Chicago Collar County Survey
Comparison of Sample Frequencies and 1990 County Populations
                              C3 Sample                  1990 Population
County
Frequency
Percent
Populations
Percent
Suburban Cook
153
45.0
2,321,341
51.85
Dupage
82
24.1
781,666
17.46
Kane
29
8.5
317,471
7.09
Lake
44
12.9
516,418
11.53
McHenry
16
4.7
183,241
4.09
Will
16
4.7
357,313
7.98
Table 3
1992 Chicago Collar County Survey
Random Digit Dialing Sampling Results
1. Total Numbers Contacted                                                                        1,891
        1.1. Ineligible Numbers                                                                            248
2. Initial Eligible Households                                                                          1,643
        2.1. Respondent Unavailable during time of survey                                    140
3. Screened Eligible Households                                                                    1,503
4. Refusals
A. Administrative Refusals
        3.1. Study pulled from field before completed                                              55
        3.2. Multiple Attempts (3)-Unsuccessful Contact                                        376
B. Respondent Refusals
        3.4. Houshold Refused                                                                                 52
        3.5. Respondent Refused to Participate                                                       475
C. Total Refusals                                                                                                958
5. Completions                                                                                                   545
6. Completion Rate/Eligible Housholds(545/1,503)                                           36.6%
7. Completion Rate/Contacted Respondents or Households(545/1072)             50.8%
Table 4
1992 Chicago Collar County Survey
Comparison of Sample Frequencies and 1990 County Populations
                                                C3 Sample               1990 Population
County 
Frequency
Percent 
Population
Percent 
 S. Cook
278 
51.0 
2,321,341 
51.85 
Dupage 
98
18.0
781,666
17.46
Kane
40
7.3
317,471
7.09
Lake 
61
11.2
516,418
11.53
McHenry
21
4.4
183,241
4.09
Will
44
8.1
357,313
7.98
 
 
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