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.
  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

Effective Response rate
= Successful cases / (Successful cases + Incomplete cases + Refusal cases + Estimated refusal cases of eligible respondents*)
= 1,006 / 1,006 + 48 + 24 + 542[(1,006 + 48 + 24) / (1,006 + 48 + 24 + 1,079)]*
= 74.6%

*Figure obtained by prorata