Stratum variance estimation for sample allocation in crop surveys. [Great Plains Corridor]
Stratum variance estimation for sample allocation in crop surveys. [Great Plains Corridor]
复制标题
作物调查中样本分配的层方差估计。
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
R. Chhikara
中科院分区：
文献类型：
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作者：
C. Perry;R. Chhikara
通过考虑一种基于层方差作为抽样单元大小的函数的概念的方法，研究了确定层方差的问题，所述层方差是通过遥感实现农作物调查的最佳样本分配所需的。一种方法，利用现有的和容易获得的历史作物统计资料，以获得初步估计的tratum方差。该程序适用于估计层方差小麦在美国大平原，并根据由此获得的数值结果进行评估。结果表明，所提出的技术是可行的，表现令人满意的，与使用一个保守的值的字段大小和作物的统计数据，从小的政治细分水平，当估计的地层方差进行比较，使用LANDSAT数据。
The problem of determining stratum variances needed in achieving an optimum sample allocation for crop surveys by remote sensing is investigated by considering an approach based on the concept of stratum variance as a function of the sampling unit size. A methodology using the existing and easily available information of historical crop statistics is developed for obtaining initial estimates of tratum variances. The procedure is applied to estimate stratum variances for wheat in the U.S. Great Plains and is evaluated based on the numerical results thus obtained. It is shown that the proposed technique is viable and performs satisfactorily, with the use of a conservative value for the field size and the crop statistics from the small political subdivision level, when the estimated stratum variances were compared to those obtained using the LANDSAT data.