Grafström Anton, Lundström Niklas L P, Schelin Lina
Department of Forest Resource Management, Swedish University of Agricultural Sciences, SE-90183 Umeå, Sweden.
Biometrics. 2012 Jun;68(2):514-20. doi: 10.1111/j.1541-0420.2011.01699.x. Epub 2011 Oct 31.
A simple method to select a spatially balanced sample using equal or unequal inclusion probabilities is presented. For populations with spatial trends in the variables of interest, the estimation can be much improved by selecting samples that are well spread over the population. The method can be used for any number of dimensions and can hence also select spatially balanced samples in a space spanned by several auxiliary variables. Analysis and examples indicate that the suggested method achieves a high degree of spatial balance and is therefore efficient for populations with trends.
提出了一种使用相等或不相等包含概率来选择空间平衡样本的简单方法。对于感兴趣变量存在空间趋势的总体，通过选择在总体中分布良好的样本，可以大大改进估计。该方法可用于任何维度，因此也可在由多个辅助变量所跨越的空间中选择空间平衡样本。分析和示例表明，所建议的方法实现了高度的空间平衡，因此对于具有趋势的总体是有效的。
