Contact Information返回


 

Date of survey

:

17-21 September 2012

 

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

:

504 successful cases

 

Effective Response rate

:

75.9%

 

Std. sampling error

:

Less than 2.2%


Table 1 Breakdown of contact information of the survey

 

Frequency

Percentage

Respondents' ineligibility confirmed

3,899

32.9

Fax/ data line

306

2.6

Invalid number

2,836

24.0

Call-forwarding/ mobile/ pager number

53

0.4

Non-residential number

191

1.6

Special technological difficulties

11

0.1

No eligible respondents

502

4.2

 

 

 

Respondents' eligibility not confirmed

3,549

30.0

Line busy

293

2.5

No answer

2,647

22.4

Answering device

191

1.6

Call-blocking

18

0.2

Language problem

114

1.0

Interview terminated before the screening question

256

2.2

Others

30

0.3

 

 

 

Respondents' eligibility confirmed, but failed to complete the interview

3,884

32.8

Household-level refusal

3

0.0

Known respondent refusal

4

0.0

Appointment date beyond the end of the fieldwork period

3844

32.5

Partial interview

21

0.2

Miscellaneous

12

0.1

 

 

 

Successful cases

504

4.3

 

 

 

Total

11,836

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*)
= 75.9%

*Figure obtained by prorata