Estimation of the Brazilian Coffee Harvest by Sampling Survey
通过抽样调查估计巴西咖啡收成AI 解读 ↓
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通过抽样调查估计巴西咖啡收成
- 研究问题
- 如何建立持续性的抽样调查估计巴西咖啡产量，并根据各州已有作物调查、产权登记或航空影像选择抽样框？
- 方法与思路
- 作者评估各州可用抽样框，提出调整既有调查、建立种植者名录并补充抽样等方案，利用试点数据估算工作量。
- 材料陈述的贡献
- 摘要称部分州已有资料可支持调查，航空影像可提供满意抽样框；另有缺乏登记的州被建议等待航空摄影调查。
- 阅读关注点
- 应核对各州抽样框覆盖、种植者名录与补充样本的衔接、产量估计精度，以及试点工作量推算和影像核查方法。
- 阅读边界
- 仅据 OpenAlex 索引摘要，稿件版本未注明，不能推断刊本变化；所述登记与影像状态属于当时背景，未提供精度或成本数值。
原文摘要
This article describes the results of an investigation, carried out on behalf of the Instituto Brasileiro do Café, into the possibilities of estimating the Brazilian coffee crop by means of a permanent sampling survey. The state of São Paulo already has a general sampling survey for the principal crops. With some modification, this would furnish estimates with adequate precision for coffee. In the states of Minas Gerais, Rio de Janeiro and Paraná, there exist registers of property owners suitable for use as frames. From them could be constructed indexes of coffee growers, so that the primary sample would be drawn from this index, with a supplementary sample from the remainder. From data of the pilot survey, an estimate is made of the volume of work which would be needed. The state of Paraná has recently been surveyed by aerial photography. It was found that this photograph provides a very satisfactory frame for sampling. The state of Espirito Santo possesses no register of property owners, and it is suggested that the sampling survey in that state will have to await a survey by aerial photography.