Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 424022
Title Biases in Farm-Level Yield Risk Analysis due to Data Aggregation
Author(s) Finger, R.
Source German Journal of Agricultural Economics 61 (2012)1. - ISSN 0002-1121 - p. 30 - 43.
Department(s) Agricultural Economics and Rural Policy Group
WASS
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) crop yield - insurance - scale - variability - variances - tests - model
Abstract We investigate biases in farm-level yield risk analysis caused by data aggregation from the farm-level to regional and national levels using the example of Swiss wheat and barley yields. The estimated yield variability decreases significantly with increasing level of aggregation, with crop yield variability at the farm-level being up to 2.38 times higher than indicated from national data. Our results show furthermore that inference on shape parameters based on aggregated data might be misleading. Using an example of farm yield insurance, we show that using crop yield variability estimates from aggregated levels leads to erroneous insurance contract specifications
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