調查方法 Survey Method返回
All surveys on the overall performance of members of the Fourth HKSAR Legislative Council are conducted by telephone interviewers under close supervision.
Such surveys began in December 2008 (when the session of the Fourth HKSAR Legislative Council began) and are conducted at least once every three month.
Target population of these surveys are Cantonese speakers in Hong Kong of age 18 or above.
Starting from mid-January 2014, telephone numbers are randomly generated using known prefixes assigned to telecommunication services providers under the Numbering Plan provided by the Office of the Communications Authority (OFCA). Invalid numbers are then eliminated according to computer and manual dialing records to produce the final sample.
Before mid-January 2014, telephone numbers are first selected randomly from telephone directories as seed numbers. Another set of numbers is then generated by using the plus/minus one/two method. Duplicate numbers are then screened out, and the remaining numbers mixed in a random order to become the final sample.
Upon successful contact being made with a target household, one member of the household is selected among those present using the "next birthday" rule.