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1 Some of the data items in this publication have undergone significant change since the release of preliminary estimates on 30 October 2001. Analysis has indicated that the early estimates were high due to problems with the survey selection frame.
NUMBER OF LIVE AGRICULTURAL ESTABLISHMENTS
4 Analysis of the non-responding population from the census indicated that the intervening sample surveys were not identifying the true extent of out-of-scope or no-longer-operating units on the frame. As a result, an investigation of samples of census non-responding units was undertaken to determine the likely extent of these units among the other non-responding units. This was used to derive an adjustment factor to apply to the responding data to account for the difference between the proportion of out-of-scope or no-longer-operating units in the 'responding' population, and the proportion of out-of-scope or no-longer-operating units in the 'non-responding' population. This adjustment factor was applied to produce the estimates presented in this publication.
REVISION OF 2000-01 PRELIMINARY DATA
5 The impact of the revision process is indicated in the table below. Preliminary estimates were produced when response was at the 65% level and before the problems with the frame were identified and measured.
6 If no adjustment had been made to the census frame, estimates of the level shown in the 'unadjusted final estimate' column would have applied. This illustrates that some level of change would have occurred from the preliminary estimates with more complete response, whether or not the frame adjustments had been necessary.
7 The final column provides the 'adjusted final estimate' after taking into account the full effects of the analysis of out-of scope and no-longer-operating units.
8 The size of the change varies by 'commodity'. This reflects the varying impact of the adjustments on different survey strata arising from the investigation of samples of census non-responding units.
COMPARISON BETWEEN PRELIMINARY, UNADJUSTED FINAL AND ADJUSTED FINAL ESTIMATES FROM 2000-01 AGRICULTURAL CENSUS
REVISION OF PREVIOUS SURVEY DATA
9 This publication provides results for the 2000-01 Agricultural Census without the usual time series (three years of data). Analysis is being undertaken on the non-responding population for the previous survey years to determine a truer estimate of live populations for those years. Adjusted estimates for previous years will be published in a forthcoming issue of Agriculture, Australia (cat. no. 7113.0).
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