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9 This release relates to information as at 31 December 2011, except for volume of data downloaded, which is for the three months ended 31 December 2011.
10 The response rate for the December 2011 IAS was 100%.
11 Where data were missing or required clarification, respondents were contacted in the first instance. When necessary, missing data were imputed based on historical data collected or live respondent means.
RELIABILITY OF DATA
12 As the IAS does not have a sample component, the data are not subject to sampling variability. However, other inaccuracies, collectively referred to as non-sampling errors, may affect the data. These non-sampling errors may arise from a number of sources, including:
13 Every effort has been made to reduce non-sampling error to a minimum by careful design and testing of questionnaires, efficient operating procedures and systems, appropriate methodology, and contact with providers to resolve anomalies. Errors in previous cycles' data are only revised (if possible) where they have a significant impact on the data released.
14 The volume of data downloaded presented should only be considered as an indicative measure of internet activity during the reference period and therefore should be used with caution.
15 Some ISPs provide proportions in lieu of actual state subscriber numbers. These data have an element of estimation and should be used with caution. Similarly, data for mobile handset subscribers are split by dedicated data subscriptions and all other active standard subscriptions. Not all ISPs keep accurate records of this disaggregation, therefore these data also have an element of estimation and should be used with caution. This does not impact on the accuracy of the mobile handset subscriber numbers at the total level.
16 A glossary of the terms used in this release can be found under the @ a Glance pages for Innovation, Science and Technology.
17 ABS releases draw extensively on information provided freely by individuals, businesses, governments and other organisations. Their continued cooperation is very much appreciated. Without it, the wide range of statistics published by the ABS would not be available. Information received by the ABS is treated in strict confidence as required by the Census and Statistics Act 1905.
18 In particular, the ABS acknowledges the assistance of the TIO in providing regular lists of registered ISPs.
19 Other ABS releases on information technology and telecommunications in Australia are:
Household Use of Information Technology, Australia, cat. no. 8146.0
Patterns of Internet Access in Australia, 2006, cat. no. 8146.0.55.001
Summary of IT Use and Innovation in Australian Businesses, cat. no. 8166.0
Selected Characteristics of Australian Business, cat. no. 8167.0
Information and Communication Technology, Australia, cat. no. 8126.0
MORE INFORMATION ON ABS INFORMATION TECHNOLOGY STATISTICS
20 Information about ABS activities in the field of information technology statistics is available from the Innovation, Science and Technology @ a Glance pages in the ABS website <www.abs.gov.au>.
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