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英文文献：Sources of measured agricultural yield difference-农业产量差异测量的来源
英文文献作者：Pieralli, Simone
英文文献摘要：
We decompose yield difference relative to a reference level into components attributable to (1) efficiency difference, and movements along the frontier due to (2) land quality, to (3) land size, and to (4) other inputs. The production frontier is built using nonparametric methods requiring no specification of the functional form of the technology. We analyze the contributions to yield relative to a reference unit in terms of the quadripartite decomposition finding that results depend on the choice of the unit of reference. If the reference unit is chosen to be the mean, land size contributions are found to be negatively correlated to yield with usual finite moments regression methods. Also nonparamteric correlation confirms the negative sign of the relationship. If the reference unit is chosen to be the median instead, land size contributions are found to be negatively correlated to yield with usual finite moments regression methods. But nonparametric correlation is not statistically significant because many farmers have no contribution to production difference from their different land sizes. Integrated squared density difference tests show in both cases efficiency has a major role in shaping the distribution.
我们将相对于参考水平的产量差异分解为可归因于(1)效率差异、(2)土地质量、(3)土地规模和(4)其他投入的沿边界运动的组成部分。生产边界是用非参数方法建立的，不需要对技术的功能形式进行说明。我们分析了在四部分分解中相对于参考单位的贡献，发现结果取决于参考单位的选择。如果选择参考单位为平均值，土地规模贡献被发现是负相关的产量通常有限矩回归方法。非顺相关也证实了这种关系的负信号。如果选择的参考单位是中值，土地面积贡献被发现是负相关的产量通常有限矩回归方法。但非参数相关在统计上不显著，因为许多农民对其不同土地规模的生产差异没有贡献。积分平方密度差检验表明，在这两种情况下，效率对形成分布有主要作用。
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