Contact InformationBack
| Survey date | : | 25-31/8/2015 | ||
| Target population | : | Cantonese-speaking Hong Kong residents aged 18 or above | ||
| Survey method | : | Random telephone survey conducted by real interviewers | ||
| Sampling method | : | Telephone numbers are randomly generated using known prefixes assigned to telecommunication services providers under the Numbering Plan provided by the Office of the Communications Authority (OFCA). Invalid numbers are then eliminated according to computer and manual dialing records to produce the final sample. If more than one eligible subject had been available, the one who had his/her birthday next was selected. |
||
|
: | 1,009 successful cases | ||
| Effective response rate | : | 66.3% (based on the number of eligible target respondents) | ||
| Standard error | : | Less than 1.6% (i.e. at 95% confidence level, the maximum sampling error of all percentages should be no more than +/-3.1 percentage points) |
| Table 1 Breakdown of contact information of the survey |
|
Frequency |
Percentage |
Respondents’ ineligibility confirmed |
5,382 |
20.6% |
Fax/ data line |
1,510 |
5.8 % |
Invalid number |
2,454 |
9.4 % |
Call-forwarding / mobile / pager number |
145 |
0.6 % |
Non-residential number |
1,219 |
4.7 % |
Special technological difficulties |
50 |
0.2% |
No eligible respondents |
4 |
0.0 % |
|
|
|
Respondents’ ineligibility not confirmed |
11,403 |
43.5% |
Line busy |
932 |
3.6 % |
No answer |
8,243 |
31.5 % |
Answering device |
1,216 |
4.6 % |
Call-blocking |
87 |
0.3 % |
Language problem |
448 |
1.7 % |
Interview terminated before the screening question |
477 |
1.8 % |
Others |
0 |
0.0 % |
|
|
|
Respondents’ eligibility confirmed, but failed to complete the interview |
8,391 |
32.0% |
Household-level refusal |
3 |
0.0 % |
Known respondent refusal |
6 |
0.0 % |
Appointment date beyond the end of the fieldwork period |
8,353 |
31.9 % |
Partial interview |
26 |
0.1 % |
Miscellaneous |
3 |
0.0% |
|
|
|
Successful cases |
1,009 |
3.9% |
|
|
|
Total |
26,185 |
100.0% |
| Table 2 Calculation of overall response rate |
|
^ Including “partial interview” and “interview terminated before the screening question”
*Including “household-level refusal” and “known respondent refusal”
