Contact Information返回

  Date of survey : 18-31 March 2010
  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 : 1,005 successful cases
  Effective Response rate : 76.6%
  Std. sampling error : Less than 1.6%

Table 1 Breakdown of contact information of the survey 

 

Frequency

Percentage

Respondents' ineligibility confirmed

10,146

44.8%

Fax/ data line

829

3.7%

Invalid number

6,868

30.3%

Call-forwarding/ mobile/ pager number

119

0.5%

Non-residential number

782

3.5%

Special technological difficulties

54

0.2%

No eligible respondents

1,494

6.6%

 

 

 

Respondents' eligibility not confirmed

5,435

24.0%

Line busy

294

1.3%

No answer

3,997

17.6%

Answering device

133

0.6%

Call-blocking

114

0.5%

Language problem

329

1.5%

Interview terminated before the screening question

533

2.4%

Others

35

0.2%

 

 

 

Respondents' eligibility confirmed, but failed to complete the interview

6,078

26.8%

Household-level refusal

12

0.1%

Known respondent refusal

17

0.1%

Appointment date beyond the end of the fieldwork period

5,900

26.0%

Partial interview

54

0.2%

Miscellaneous

95

0.4%

 

 

 

Successful cases

1,005

4.4%

 

 

 

Total

22,664

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*)
= 1,005 / 1,005 + 54 + 29 + 533[(1,005 + 54 + 29) / (1,005 + 54 + 29 + 1,494)]*
= 76.6%

*Figure obtained by prorata