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STRAT2D: Optimal bi-variate stratification system

Abstract

Statistics New Zealand is responsible for the production of New Zealand’s leading economic indicators, eg Gross Domestic Product, the Balance of Payments and the Consumers Price Index. It is imperative that these statistics are of a high quality. However, it is also important that these statistics are produced at a minimum compliance cost to New Zealand businesses. STRAT2D is a sample design tool developed at Statistics New Zealand that allows a given quality of statistics to be produced using a smaller sample size, and thus less compliance cost than was previously possible. STRAT2D is more efficient than earlier tools because it employs two-dimensional stratification, where previous tools used one-dimensional stratification.

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