2010 Radio Ratings Survival Kit - Nielsen

Over all cities surveyed, an average of 83% of diaries that are placed are returned useable and entered into the computer to comprise the sample.
The Nielsen Company - 2010 Radio Survival Kit.
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Whilst the survey method used is loosely called the "diary method", it should more correctly be called the "diary/personal interview method" since diaries are placed and collected
personally in contrast to diary methods used in other parts of the world where diaries are posted to respondents.
7. DATA PREPARATION
After completed diaries are returned to our Sydney office, they are subject to editing by a separate staff of experienced editors, quite independent of field interviewers or data
preparation personnel. In-office editing procedures aim to check the consistency of diary records and to validate the consistency of station identification.
8. COMPUTING
After the in-office editing process, all records are transferred directly into the computer using equipment in our Sydney office. All batch computer runs for reports are conducted on our
in-house computer in Sydney.
9. RAISING FACTORS
Population details for each market are entered into the computer at the start of each year and as each survey is processed, details of the sample composition are also entered into the
computer. By dividing each population figure by its corresponding sample size, the computer calculates raising factors for each age/sex group and for each grocery buyer group. This
means that each person is given a separate "weight" in order to ensure his or her true importance in all projected results as shown in this report. Thus if one particular group is undersampled,
each person in it is given a higher weighting: or if a group is over-sampled, each person is given a lower weighting. All projected results in this report are shown to the
nearest 1,000 persons in Sydney, Melbourne, Brisbane, Adelaide, Perth and Newcastle (nearest 100 persons elsewhere).
10. SPECIFICATIONS
The specifications of this survey meet the requirements of an Industry Committee comprising representatives of Commercial Radio Australia Ltd and by invitation, the Australian
Broadcasting Corporation.
Radio surveys are audited by an independent auditor (appointed by Commercial Radio Australia.) who has free and unrestricted access to all field documents and office procedures.
Details of the Auditor's reports are available upon request to Commercial Radio Australia Ltd.
11. ERRORS, OMISSIONS etc.
Each report is issued subject to any errors and omissions. Although every reasonable precaution has been taken to present accurate information, it is possible that there may be some
inaccuracies, such as faulty designation of programmes. In these cases-
As listeners provide the information about the stations to which they listen and the times they listen, and
As the stations provide details of the programmes and their days and times of broadcast, a programme incorrectly listed has no bearing on the validity of the figures in the report.