However, when extrapolating from a surveyed group to the overall population, there is an enormous difference between preference questions (which are used in election polls) and numerical questions (as in cybercrime surveys).
He said that the trickiest part was when they read out a list of words but instead of asking you to repeat them they moved on to some numerical questions before asking you to list the words a moment later.
The questionnaire was designed for the subjects' responses to be read by Optical Character Reading (OCR) software via a scanner (Readsoft, 2011), and, where possible, it asked the respondent to give exact replies to numerical questions, in order to maximise data detail, rather than offering multiple-choice boxes to select between pre-formed ranges.
Data quality assurance measures will be embedded during conduct of the CATI, including staff training to ensure standard administration of survey items and inclusion of range checks for numerical questions as appropriate (eg, number of staff in service, number of children enrolled).
Practice numerical questions regularly.
Read the numerical questions minutely.
Copy tables provided with the numerical questions.
Then, based on the equation, objective function, design variables and constraints are designated, so the structural optimization problem was transferred to a numerical optimization question.
