is completed face-to-face and the Interviewers enter the responses into a
database using dedicated software on a tablet during the interview. There
are a number of validations processes that are undertaken to ensure that the
data collected is as clean as possible. These processes are outlined below.
The processes of
validation of the Passenger Survey Database are undertaken at four stages.
The first stage
of validation occurs at the when the Interviewer inputs the responses into the
Interviewer will assesses each response on the questionnaire to determine that
the information being recorded makes sense. If not the Interviewer will
probe the response with the passenger.
Input software has a range of validations that trap coding and interviewing
errors on many of the questions. Some examples of these validations are listed
Interviewer is unable to input a response because a particular code is not on
the relevant reference table or if they have a specific query with that
response then they are able to "flag" that question. This involves
inputting a temporary code that is then subsequently revised.
Each flag is
assessed and temporary codes are replaced with the correct code. Where
necessary, new codes are added to reference tables.
database is also subject to a series of validation checks prior to the
weighting process to ensure the integrity of various aspects of the data. This
is an ongoing process throughout the year minimising the number of records
which have to be discarded as a result of missing, incorrect or ambiguous data.
may be necessary in order to enable the weighting process to run correctly –
for example, harmonisation of codeshare flight numbers.
In addition to
the above measures, the data is subject to ongoing Quality Control inspections
to ensure the integrity is the highest possible. This covers all aspects of the
data, including the final weights calculated.
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