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| Registros recuperados: 11 | |
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| Musser, Wesley N.; Alexander, Vickie J.; Tew, Bernard V.; Smittle, Doyle A.. |
| Rotations have historically been used to alleviate pest problems in crop production. This paper considers methods of modeling rotations in linear programming models for Southeastern vegetable production. In such models, entering each possible crop rotation as a separate activity can be burdensome because of the large numbers of possible rotational alternatives. Conventional methodology for double crop rotations reduces the number of activities but must be adapted to accommodate triple crop rotational requirements in vegetable production. This paper demonstrates these methods both for a simple example and an empirical problem with numerous rotation alternatives. While the methods presented in this paper may have computational disadvantages compared to... |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1985 |
URL: http://purl.umn.edu/29375 |
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| Broder, Josef M.; Tew, Bernard V.; Williams, Jeffery R.. |
| Risk management strategies for maintaining student performance in large classes are discussed. Risk management theory is discussed and used to describe student behavior. Results of risk management experiments in which students are exposed to alternative levels of grading are reported along with other factors which influence student behavior. Class performance was not found to decline under a system involving only a 50 percent chance of assignments being graded. Procedures for implementing and limitations of chance grading systems in large classes are discussed. |
| Tipo: Journal Article |
Palavras-chave: Teaching/Communication/Extension/Profession. |
| Ano: 1985 |
URL: http://purl.umn.edu/29986 |
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| Tew, Bernard V.; Reid, Donald W.. |
| This study shows that the price-yield correlation is a major influence in determining the skewness of revenue. Therefore, normality for revenue may not be rejected even if the price and/or yield distributions are significantly skewed. Analysis of cotton revenue for Mississippi shows that this can be the case empirically when the correlation between price and yield is moderately negative and the relative variability of yield and price is not too high. Hence, for crops produced in their major production regions where negative correlations between prices and yields are the greatest, revenue distributions may have a greater tendency toward normal. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1988 |
URL: http://purl.umn.edu/28827 |
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| Reid, Donald W.; Tew, Bernard V.. |
| This article evaluates the performance of expected value and expected value-variance criteria in achieving risk efficiency in crop selection. Results indicate that the expected returns criterion achieves risk efficiency in many situations because of constraints. However, in the absence of many constraints the expected returns criterion performs poorly except when highly mean-dominant activities are present. The expected value-variance criterion achieves a high degree of risk efficiency for all situations examined. This result implies that criteria more complex than expected value-variance are not necessary for crop selection analysis, given empirical returns distributions. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries. |
| Ano: 1987 |
URL: http://purl.umn.edu/28985 |
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| Tew, Bernard V.; Musser, Wesley N.; Smith, G. Scott. |
| Specification of the variance-covariance matrix holds continuing interest for agricultural economists considering risk programming applications. This research examines alternative expected value-variance (E-V) frontiers constructed using contemporaneous and non-contemporaneous data and two statistical assumptions concerning crop prices and yields. Empirical examples from two locations for different crops illustrate the various assumptions. Considerable differences in the E-V efficient frontiers occur in both empirical settings. |
| Tipo: Journal Article |
Palavras-chave: Risk and Uncertainty. |
| Ano: 1988 |
URL: http://purl.umn.edu/29066 |
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| Registros recuperados: 11 | |
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