Forecasting World Crop Yields as Probability Distributions
Traditionally, agricultural forecasts, whether for the coming year or several years into the future, have been based on assumptions of normal weather and trend crop yields. That weather is seldom normal and that yields seldom fit trends are well recognized. However, relatively little attention has been given to projecting crop yields stochastically even though computer capacity and software programs are available to do so. One reason is that the task is more challenging than to assign standard deviations to various crop yields and simulate normal distributions using random number generators. For one, deviations of crop yields from trends may be correlated especially if the locations of the crops overlap such as is the case with US corn and soybeans. To model US agriculture, those correlations must be taken into account. Secondly, deviations of crop yields from trends may not be normal. Typically, crop yield deviations are skewed to the low side, with yields lower in poor crop years than higher in favorable crop years. This paper demonstrates how computer software programs can be used to generate probability distributions of yields taking into consideration correlations among crops and non-normality in distributions. Included are thirteen crops and crop aggregates with global coverage of coarse grains, wheat and oilseeds. Probability forecasts are made for 2006 and illustrated for US corn, soybeans and wheat.
|Date of creation:||2006|
|Date of revision:|
|Contact details of provider:|| Web page: http://www.iaae-agecon.org/|
More information through EDIRC
References listed on IDEAS
Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
- repec:ags:joaaec:v:30:y:1998:i:1:p:21-33 is not listed on IDEAS
- Teigen, Lloyd D. & Bell, Thomas M., 1978. "Confidence Intervals For Corn Price And Utilization Forecasts," Agricultural Economics Research, United States Department of Agriculture, Economic Research Service, issue 1.
- Richardson, James W. & Klose, Steven L. & Gray, Allan W., 2000.
"An Applied Procedure For Estimating And Simulating Multivariate Empirical (Mve) Probability Distributions In Farm-Level Risk Assessment And Policy Analysis,"
Journal of Agricultural and Applied Economics,
Southern Agricultural Economics Association, vol. 32(02), August.
- Richardson, James W. & Klose, Steven L. & Gray, Allan W., 2000. "An Applied Procedure for Estimating and Simulating Multivariate Empirical (MVE) Probability Distributions In Farm-Level Risk Assessment and Policy Analysis," Journal of Agricultural and Applied Economics, Cambridge University Press, vol. 32(02), pages 299-315, August.
- repec:ags:joaaec:v:32:y:2000:i:2:p:299-315 is not listed on IDEAS
When requesting a correction, please mention this item's handle: RePEc:ags:iaae06:25649. See general information about how to correct material in RePEc.
For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: (AgEcon Search)
If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.
If references are entirely missing, you can add them using this form.
If the full references list an item that is present in RePEc, but the system did not link to it, you can help with this form.
If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your profile, as there may be some citations waiting for confirmation.
Please note that corrections may take a couple of weeks to filter through the various RePEc services.