The real total consumption (recorded plus unrecorded) of beer, wine and spirits is usually unknown. Estimates based on surveys usually cover just a fraction of the real consumption. Exactly how large these fractions (the coverage rates) are is also unknown, since the real consumption is unknown. This article presents a method of estimating these coverage rates. The problem is to obtain enough data sets of the right type for this estimation. The method is applied on Norwegian data. The method provides satisfactory results for estimation of total consumption and thereby for total unrecorded consumption, but (so far) not for estimating the different parts of the unrecorded consumption.
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