Crops Production Survey 2008 - Philippines

Abstract
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The CrPS is conducted quarterly to generate production estimates for crops other than cereals at the national, regional and provincial levels disaggregation. Out of the 230 crops covered, the individual estimates of the 19 crops highlighted in the Quarterly Report on the Production in Agriculture are released at the national level while the rest were lumped as "Other Crops". Provincial level estimates are available on an annual basis.

The survey aims to support the data needs of planners, policy and decision makers and other stakeholders in the agricultural sector, and to provide periodic updates on crop related developments. The survey adopts two-stage sampling with the municipality as the Primary Sampling Unit and the households as the Secondary Sampling Unit.

Geographic coverage
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National Coverage

Analysis unit
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Households

Universe
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The survey covers all small farm producers and plantation farms of all agricultural crops, other than palay and corn, nationwide .

Kind of data
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Sample survey data [ssd]

Sampling procedure
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The survey employs two-stage sampling design with municipality as the Primary Sampling Units (PSU) and farmer-producer as the Secondary Sampling Units (SSU).

Farms are classified as small farms and plantation farms. For small farms, crops are classified based on coverage of the Farm Price Survey, i.e. Farm Price Survey and non-Farm Price Survey. For crops under Farm Price Survey, the top five producing municipalities based on the volume of production were chosen as PSU. In each municipality, five sample farmer-producers as SSU were enumerated. For small farms of all other crops not covered under Farm Price Survey, top two to three producing municipalities were chosen as PSUs. In each municipality, three sample farmer-producers as SSU were enumerated.

This scheme is applied to each of the crops being covered every survey round. It is possible for a farmer-producer to be a respondent for several crops, which he plants and harvests during the reference quarter. Classification for plantation farms is based on the cut-off on area planted. Each survey round covers a maximum of 5 plantations by crop.

The above scheme was adopted since 2005 to date. The sampling design for CrPS has undergone several changes. From 1988 until 2000, the survey adopted three stage sampling or 5x5x5. This is intended to represent the five (5) municipalities as the PSU, five barangays as the SSU and five (5) households as the USU. In May 2000, a two stage sampling was adopted with the five (5) top producing municipalities as the PSU and five farmers-producers as the SSU.

For coconut, the sampling procedure was in collaboration with the PCA which was developed in 1996. The Bureau was responsible for the survey methodology and data processing while the PCA was responsible for the data collection. A three-stage sampling was employed. The domain of the survey is the municipality, classified as coastal flat, coastal upland, inland flat, and inland upland. The barangays, also classified according to the classification used for the municipalities, serve as the first stage. The second stage is the two coconut farmers from each sample barangay drawn using simple random sampling. The third stage is the 10 sample coconut trees lying along the longest diagonal line bisecting the parcel. The sampling design cut across the small and plantation farms and remain the same until the frame is updated or the sampling design is changed.

The survey was piloted in Davao Region provinces which started on the fourth quarter of 1996. This was replicated in the Western Visayas provinces in the first quarter of the following year. The provinces in the rest of the regions conducted this survey beginning in June 1997. The PASOs and the Provincial Coconut Development Managers jointly validate the results. The PASOs forward the result to the region for further joint review by the RASOs and the Regional Managers.

Mode of data collection
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Face-to-face paper [f2f]

Cleaning operations
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Editing is done in four stages during the data review. The initial stage is at the collection point while with the respondent. This starts with the completeness and correctness of the entries in the answer grid. The yield per unit area, or kilograms per bearing tree and planting density were computed and verified with the respondents when these are out of range. The range varies by crop and reference period. The farmer-respondents are asked on the climatic condition a quarter ago up to the prevailing quarter and explanations on the change in the level against the same period a year ago. During the Provincial Data Review, Regional Data Review and National Data Review, data editing is done after encoding and data transfer from one form or system to another during the generation of estimates.

Data appraisal
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The estimates are subjected to three levels of data review and validation. These are the Provincial Data Review (PDR), Regional Data Review (RDR) and National Data Review (NDR). Across all data validation levels, a set of parameters is being used as guideposts and the available data from other agencies.

The existing indicators also accounts for the situation in the province. At the RDR, the data is assessed to reflect the situation of the region and the levels in comparison between and among the provinces in the region. At the NDR, the data are validated in comparison to national level data and the data between and among the regions. To some extent and for valid reasons, this involves adjustment of the levels of the data generated.

摘要
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农作物生产预估调查（CrPS）每季度进行一次，旨在为国家、区域和省级层面提供除谷物以外的农作物产量预估。在涵盖的230种农作物中，季度农业生产报告重点提及的19种农作物的个体预估数据在国家层面发布，其余的则归类为“其他农作物”。省级层面的预估数据每年更新一次。

调查旨在满足规划者、政策制定者、决策者以及其他农业领域利益相关者的数据需求，并定期提供与农作物发展相关的更新。该调查采用两阶段抽样方法，以市镇为一级抽样单位，家庭为二级抽样单位。

地理覆盖范围
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全国覆盖

分析单位
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家庭

调查范围
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调查涵盖全国范围内所有小规模农场和种植园农场，涉及除稻米和玉米以外的所有农业作物。

数据类型
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样本调查数据 [ssd]

抽样程序
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该调查采用两阶段抽样设计，以市镇作为一级抽样单位（PSU），以农民生产者作为二级抽样单位（SSU）。

农场被划分为小规模农场和种植园农场。对于小规模农场，农作物分类基于农场价格调查的覆盖范围，即农场价格调查和非农场价格调查。对于农场价格调查下的农作物，根据产量量选择了前五个生产市镇作为PSU。在每个市镇中，选择了五个样本农民生产者作为SSU。对于所有其他未涵盖在农场价格调查下的农作物的小规模农场，选择了前两个至三个生产市镇作为PSU。在每个市镇中，选择了三个样本农民生产者作为SSU。

此方案适用于每次调查周期中覆盖的每种农作物。农民生产者可能对他在参考季度内种植和收获的几种农作物都负有回答责任。种植园农场的分类基于种植面积的上限。每个调查周期涵盖每种农作物最多五个种植园。

自2005年起，一直采用上述方案。CrPS的抽样设计经历了多次变化。从1988年至2000年，调查采用三阶段抽样或5x5x5。这是旨在代表五个（5）市镇作为PSU，五个村作为SSU，以及五个（5）家庭作为USU。2000年5月，采用了两阶段抽样，前五个（5）最高生产市镇作为PSU，五个农民生产者作为SSU。

对于椰子，抽样程序与PCA合作开发，该合作始于1996年。该局负责调查方法和数据处理，而PCA负责数据收集。采用了三阶段抽样。调查领域为市镇，分类为沿海平原、沿海丘陵、内陆平原和内陆丘陵。根据用于市镇的分类，村作为第一阶段。第二阶段是从每个样本村中通过简单随机抽样抽取的两个椰子农民。第三阶段是位于划分地块最长对角线上的10棵样本椰子树。抽样设计跨越了小规模农场和种植园农场，并在框架更新或抽样设计更改之前保持不变。

该调查在达沃地区省份进行了试点，始于1996年第四季度。次年第一季度，在西方维萨亚斯省份进行了复制。其他地区的省份从1997年6月开始进行此调查。PASOs和省椰子发展经理共同验证结果。PASOs将结果转发到地区，由RASOs和地区经理进一步联合审查。

数据收集方式
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面对面纸质调查 [f2f]

数据清理操作
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在数据审查过程中进行四个阶段的数据编辑。第一阶段是在收集点与受访者一起进行。这始于答案网格中条目的完整性和正确性。当单位面积产量、每棵结果树千克数和种植密度超出范围时，会与受访者计算和验证。范围因作物和参考期间而异。询问农民受访者上一个季度至当前季度的气候条件，以及与去年同期相比水平变化的解释。在省数据审查、区域数据审查和国家数据审查期间，在编码和数据从一种形式或系统传输到另一种形式或系统以生成估计时进行数据编辑。

数据评估
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估计数据受到三个级别的数据审查和验证。这些是省数据审查（PDR）、区域数据审查（RDR）和国家数据审查（NDR）。在所有数据验证级别上，都使用一套参数作为指南，并使用来自其他机构的数据。

现有的指标还考虑了该省的情况。在RDR中，评估数据以反映该地区的情况以及该地区内和省与省之间的水平比较。在NDR中，数据与国家级数据以及地区间数据进行验证。在某种程度上，出于有效的原因，这涉及到对生成数据水平的调整。