The Austrian microcensus is the biggest sample survey of the Austrian population, it<br />is a regionally stratied cluster sample with a rotational pattern. The sampling fractions<br />dier signicantly between the regions, therefore the sample size of the regions is quite<br />homogeneous. The primary sampling unit is the household, within each household all<br />persons are surveyed. The design weights are the input for the calibration on population<br />counts and household forecasts. It is

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... rformed by iterative proportional tting. Until<br />the third quarter of 2014 only demographic, regional and household information were<br />used in the weighting procedure. From the fourth quarter 2014 onwards the weighting<br />process was improved by adding an additional dimension to the calibration, namely a<br />labour status generated from administrative data and available for the whole population.<br />Apart from that some further minor changes were introduced. This paper describes the<br />methodological and practical issues of the microcensus weighting process and the variance<br />estimation applied from 2015 onwards. The new procedure was used for the rst time<br />for the forth quarter of 2014, published at the end of March 2015. At the same time, all<br />previous microcensus surveys back to 2004 were reweighted according to the new approach.