英文文献：Nonparametric Estimation of Crop Yield Distributions: A Panel Data Approach-作物产量分布的非参数估计:一种面板数据方法
英文文献作者：Wu, Ximing,Zhang, Yu Yvette
英文文献摘要：
We propose a flexible nonparametric density estimator for panel data. One possible areas of application is estimation of crop yield distributions whose data tend to be short panels from many geographical units. Taking into account the panel structure of the data can likely improve the efficiency of the estimation when the crop distributions share some common futures over time and cross-sectionally. We apply this method to estimate annual average crop yields of 99 Iowa counties. The results demonstrate the usefulness of the proposed method to estimate simultaneously densities from a large number of cross-sectional units.

针对面板数据，提出了一种灵活的非参数密度估计方法。一个可能应用的领域是估计作物产量分布，其数据往往是来自许多地理单元的短面板。考虑数据的面板结构可能会提高估计的效率，当作物分布具有一些共同的未来时间和横截面。我们用这种方法估算了爱荷华州99个县的年平均作物产量。结果表明，该方法可以从大量的横截面单元同时估计密度。