Contact InformationBack
| Date of survey | : | 11 - 20 May 2009 | |
| Survey method | : | Telephone survey with interviewers | |
| Target population | : | Hong Kong working population of age 18 or above | |
| Sampling method | : | All data were collected by our interviewers using a Computer Assisted Telephone Interview (CATI) system which allowed real-time data capture and consolidation. To ensure data quality, on top of on-site supervision, voice recording, screen capturing and camera surveillance were used to monitor the interviewers' performance.
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|
| Sample size | : | 1,006 successful cases | |
| Effective Response rate | : | 74.6% | |
| Std. sampling error | : | Less than 1.6% |
| Table 1 Breakdown of contact information of the survey |
|
Frequency |
Percentage |
Respondents' ineligibility confirmed |
10,780 |
46.9% |
Fax/ data line |
1,004 |
4.4% |
Invalid number |
7,321 |
31.8% |
Call-forwarding/ mobile/ pager number |
157 |
0.7% |
Non-residential number |
1,160 |
5.0% |
Special technological difficulties |
59 |
0.3% |
No eligible respondents |
1,079 |
4.7% |
|
|
|
Respondents' eligibility not confirmed |
4,638 |
20.2% |
Line busy |
363 |
1.6% |
No answer |
3,243 |
14.1% |
Answering device |
74 |
0.3% |
Call-blocking |
87 |
0.4% |
Language problem |
266 |
1.2% |
Interview terminated before the screening question |
542 |
2.4% |
Others |
63 |
0.3% |
|
|
|
Respondents' eligibility confirmed, but failed to complete the interview |
6,577 |
28.6% |
Household-level refusal |
12 |
0.1% |
Known respondent refusal |
12 |
0.1% |
Appointment date beyond the end of the fieldwork period |
6,316 |
27.5% |
Partial interview |
48 |
0.2% |
Miscellaneous |
189 |
0.8% |
|
|
|
Successful cases |
1,006 |
4.4% |
|
|
|
Total |
23,001 |
100.0% |
| Table 2 Calculation of effective response rate |
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