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Zugl.: Göttingen, Univ., Diss., 2009

Master-Arbeit Univ. St. Gallen, 2007.

Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 89-92).

Doctor of Philosophy / Department of Agricultural Economics / Jason S. Bergtold / Jessica L. Heier Stamm / Applied research in agricultural economics often involves a discrete process. Most commonly, these applications entail a conceptual framework, such as random utility, that describes a discrete-variable data-generating process. Assumptions in the conceptual framework then imply a particular empirical model. Common approaches include the binary logit and probit models and the multinomial logit when more than two outcomes are possible. Conceptual frameworks based on a discrete choice process have also been used even when the dependent variable of interest is continuous. In any case, the standard models may not be well suited to the problem at hand, as a result of either the assumptions they require or the assumptions they impose. The general theme of this dissertation is to adopt seldom-used empirical models to standard research areas in the field through applied studies. A common motivation in each paper is to lessen the exposure to specification concerns associated with more traditional models. The first paper is an attempt to provide insights into what --- if any --- weather patterns farmers respond to with respect to cropping decisions. The study region is a subset of 11 north-central Kansas counties. Empirically, this study adopts a dynamic multinomial logit with random effects approach, which may be the first use of this model with respect to farmer land-use decisions. Results suggest that field-level land-use decisions are significantly influenced by past weather, at least up to ten years. Results also suggest, however, that that short-term deviations from the longer trend can also influence land-use decisions. The second paper proposes multiple-output artificial neural networks (ANNs) as an alternative to more traditional approaches to estimating a system of acreage-share equations. To assess their viability as an alternative to traditional estimation, ANN results are compared to a linear-in-explanatory variables and parameters heteroskedastic and time-wise autoregressive seemingly unrelated regression model. Specifically, the two approaches are compared with respect to model fit and acre elasticities. Results suggest that the ANN is a viable alternative to a simple traditional model that is misspecified, as it produced plausible acre-response elasticities and outperformed the traditional model in terms of model fit. The third paper proposes ANNs as an alternative to the traditional logit model for contingent valuation analysis. With the correct network specifications, ANNs can be viewed as a traditional logistic regression where the index function has been replaced by a flexible functional form. The paper presents methods for obtaining marginal effect and willingness-to-pay (WTP) measures from ANNs, which has not been provided by the existing literature. To assess the viability of this approach, it is compared with the traditional logit and probit models as well an additional semi-nonparametric estimator with respect to model fit, marginal effects, and WTP estimates. Results suggest ANNs are viable alternative and may be preferable if misspecification of the index function is a concern.

I samband med den pågående urbaniseringen är det viktigt att vi tar hand om och bevarar de grönområden som finns i våra städer. Genom denna studie undersöks boende i Luleå kommuns betalningsvilja för förändringar i form av en investering på Gültzauudden. Bakomliggande faktorer till individens betalningsvilja undersöks, där individens hälsa för första gången inkluderas. En enkät, som inspirerats av metoden contingent valuation, har skickats ut via Facebook och till två företag i Luleå. Studien undersöker endast vuxna i Luleå kommuns betalningsvilja för ett specifikt grönområde. Med hjälp av 218 observationer fastställdes den individuella genomsnittliga betalningsviljan till 134 SEK. Det totala ekonomiska värdet av förbättringar på Gültzauudden i form av en investering uppgår till cirka åtta miljoner kronor. Faktorer som påverkar individens betalningsvilja är om individen besöker området för en kulturaktivitet, kön och hälsotillstånd. Investeringar som kan satsas på är fler grillplatser, anordning av kulturevenemang och utomhusgym.

Early intervention programs for handicapped preschool children may have long-term implications for the children and their families. Economic eva luations of these programs have been conducted to measure costs and bene fit s, but parental wi l lingness-to-pay has been overlooked in these analyses. Parental willingness-to-pay, as a measure of consumer surplus, could complete the measure of benefits and provide both policymakers and practitioners with useful information for decisionmaking. In this study, the impli cations of eliciting willingness-to-pay responses for an early intervention program for handicapped preschoolers are discussed. A survey technique, known as the contingent valuation method (CVM) , is applied to program to empirically estimate wil lin gness-to-pay for the total program and for particular components of the program. Also investigated are the implications of using a rationality test in the survey to determine if consumer responses are in accordance with assumptions for rational consumer behavior. Results indicate relatively high willingness-to-pay for the program as whole, but low value is associated with program components. This implies that parents may value these programs more for the respite rather than specialized services offered. Results of the rationality test support the hypothesis that such a measure is necessary in survey designs of this nature.

This study analyzed preferences for wetland-loss prevention in coastal Louisiana. Data were obtained through a contingent-valuation mail survey of a random sample of Louisiana households. Results, based on 511 responses, indicate that respondents have a strong preference for a short-run program (72.41% chose this program over a long-run program or no action). Respondents that had higher incomes, were white, had prior knowledge of ongoing restoration efforts, and had confidence in government were more likely to support some program relative to no action, as were those citing hurricane, environmental, and/or climate-change protection as their primary concern. Older respondents and those with negative perceptions of climate change were more likely to prefer the short-run over the long-run program. Median net present value of willingness to pay (assuming 18.37% discount rate) was estimated at $17,491 per household for the multinomial logit model and $3,307 under the Turnbull lower-bound method.

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