Contact Information返回

  Date of survey : 19-30 September 2011
  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.
  Sample size : 502 successful cases
  Effective Response rate : 78.7%
  Std. sampling error : Less than 2.2%

Table 1 Breakdown of contact information of the survey 

 

Frequency

Percentage

Respondents' ineligibility confirmed

5,866

39.4%

Fax/ data line

416

2.8%

Invalid number

4,344

29.2%

Call-forwarding/ mobile/ pager number

80

0.5%

Non-residential number

250

1.7%

Special technological difficulties

80

0.5%

No eligible respondents

696

4.7%

 

 

Respondents' eligibility not confirmed

4,203

28.2%

Line busy

421

2.8%

No answer

3,166

21.3%

Answering device

180

1.2%

Call-blocking

56

0.4%

Language problem

123

0.8%

Interview terminated before the screening question

252

1.7%

Others

5

0.0%

 

 

Respondents' eligibility confirmed, but failed to complete the interview

4,320

29.0%

Household-level refusal

6

0.0%

Known respondent refusal

1

0.0%

Appointment date beyond the end of the fieldwork period

4,287

28.8%

Partial interview

20

0.1%

Miscellaneous

6

0.0%

 

 

Successful cases

502

3.4%

 

 

Total

14,891

100.0%

Table 2 Calculation of effective response rate

Effective Response rate
= Successful cases / (Successful cases + Incomplete cases + Refusal cases + Estimated refusal cases of eligible respondents*)
= 78.7%

*Figure obtained by prorata