Contact informationBack
Date of survey |
: | 26 January to 8 February 2011 | |
Survey method |
: | Telephone survey conducted by telephone interviewers | |
Target population |
: | Cantonese-speaking Hong Kong citizens of age 18 or above | |
Sampling method |
: | Telephone numbers were first drawn randomly from the residential telephone directories as "seed numbers", from which another set of numbers was generated using the "plus/minus one/two" method, in order to capture the unlisted numbers. Duplicated numbers were then filtered, and the remaining numbers were mixed in random order to produce the final telephone sample. When telephone contact was successfully established with a target household, one target respondent was selected. | |
Sample size |
: | 1,011 successful cases | |
Effective Response rate |
: | 58.2% | |
Std. sampling error |
: | Less than 1.6 percentage points. In other words, the sampling error for all percentages based on the full sample was less than plus/minus 3.1 percentage points at 95% confidence level. |
| Table 1 Calculation of effective response rate |
|
^ Including "household-level refusal" and "known respondent refusal"
| Table 2 Breakdown of contact information of the survey |
|
Frequency |
Percentage |
Respondents' ineligibility confirmed |
7,598 |
38.2% |
Fax/ data line |
702 |
3.5% |
Invalid number |
6,095 |
30.7% |
Call-forwarding/ mobile/ pager number |
128 |
0.6% |
Non-residential number |
542 |
2.7% |
Special technological difficulties |
105 |
0.5% |
No eligible respondents |
26 |
0.1% |
|
|
|
Respondents' eligibility not confirmed |
3,530 |
25.1% |
Line busy |
274 |
1.9% |
No answer |
2,344 |
16.7% |
Answering device |
117 |
0.8% |
Call-blocking |
71 |
0.5% |
Language problem |
296 |
2.1% |
Interview terminated before the screening question |
420 |
3.0% |
Others |
8 |
0.1% |
|
|
|
Respondents' eligibility confirmed, but failed to complete the interview |
3,349 |
23.8% |
Household level refusal |
2 |
0.0% |
Known respondent refusal |
15 |
0.1% |
Appointment date beyond the end of the fieldwork period |
3,267 |
23.2% |
Partial interview |
52 |
0.4% |
Miscellaneous |
13 |
0.1% |
|
|
|
Successful cases |
1,006 |
7.2% |
|
|
|
Total |
14,060 |
100.0% |
