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| Registros recuperados: 16 | |
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| Tronstad, Russell. |
| Classification and Regression Trees (CART), a computer intensive nonparametric classification method, was used to model weekly Los Angeles wholesale prices (1990-93) for twelve different melon types. CART explained more of the variation in melon prices than did an ordinary least squares (OLS) regression with dummy variables. Explanatory variables ranked as the most-to-least important by CART are as follows: week, type of melon, year, size, grade, and shipping container. The most notable price change occurs when prices fall after 13 May. |
| Tipo: Journal Article |
Palavras-chave: Demand and Price Analysis. |
| Ano: 1995 |
URL: http://purl.umn.edu/30924 |
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| Thompson, Gary D.; Aradhyula, Satheesh V.; Tronstad, Russell. |
| A supply-response model for Florida fresh tomatoes is specified to analyze the impacts of the U.S. Department of Commerce's suspension agreement which governs imports of fresh tomatoes from Mexico. The particular focus is on the impact of the "reference" price which causes Mexican imports in a given week to cease if import prices in the prior week fall to the reference price. Using weekly weather data, a growing degree day (GDD) variable is constructed which predicts week of first harvest and duration of harvest. The GDD variable is used to construct the appropriate, variable lag length for weekly acres planted in four Florida production regions. A composite switching-regime model is estimated in which the regime prior to the suspension agreement... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: International Relations/Trade. |
| Ano: 2005 |
URL: http://purl.umn.edu/19378 |
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| Tronstad, Russell; Teegerstrom, Trent. |
| We estimate the weight gain for range calves as a polynomial function of calf age accounting for weather, sex, lagged calf weights relative to the growth function, and compensatory gains. Birth weights plus single day weighings that occurred around 3, 8, 12, and 20 months of age are the data used to estimate our growth function. This function is then used to determine the economic trade-off between herd size and calf sale weights, for both spring and fall sale dates. In addition, we evaluate the profitability of feeding supplement by increasing the rate of gain associated with our growth function when forage and nutrients are limiting for the two grazing environments of Southeast and Central Arizona. Using prices from 1980 to 1998, results indicate that... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Livestock Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/36058 |
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| Tronstad, Russell; Huthoefer, Lori Stephens; Monke, Eric A.. |
| Marketing concepts associated with quality, location, and time are integrated into a complete model, revealing the linkages between market window approaches and hedonic analysis. An integrated hedonic price model for the U.S. apple industry was estimated. Results suggested that size, storage method, grade, and seasonality are the most important influences on the price of apples. Area of apple origin and variety were the least important influences on apple prices, with the exception of the Granny Smith variety. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Industrial Organization. |
| Ano: 1992 |
URL: http://purl.umn.edu/30940 |
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| Aradhyula, Satheesh V.; Tronstad, Russell. |
| We estimate a simultaneous bivariate qualitative choice model of Arizona agribusiness firms propensity to trade and visit as a tourist with the cross-border state of Sonora, Mexico. The trade equation is estimated as an ordered probit model with responses of: 1) a firm has not ever traded or investigated doing any trading activities with Sonora, 2) the firm has not done any trade with Sonora but they have investigated doing business in this cross-border state, and 3) the firm has traded with Sonora, either directly or through a second handler like a broker. A proprietors propensity to visit Sonora as a tourist is modeled from the binary response of whether the individual has ever visited Sonora as a tourist or not. Simultaneity arises since both trade and... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: International Relations/Trade. |
| Ano: 2001 |
URL: http://purl.umn.edu/36067 |
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| Tronstad, Russell; Silvertooth, Jeffrey C.; Husman, Steve. |
| We utilize Classification and Regression Tree analysis to categorize the return of extending the season for upland. High, medium, and low values for cost of water, lint prices, and quality discount/premiums were applied to the lint yield and quality differentials realized from 198 irrigation termination experiments conducted in central Arizona for the crop years of 1991, 1992, 1994, 1996, 1996, 1997, and 2000. The progression of each crop was analyzed using heat units (86/55 F). The relative ranking results of CART, where the most important variable is normalized on 100, were: variety (100), additional heat units after IT-1 (94), yield of IT-1 (93), crop year (83), micronaire associated with IT-1 (68), HUAP for IT-1 (67), lint price (5), water cost (2),... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/36088 |
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| Tronstad, Russell. |
| Parallels are drawn between shortcomings and events that occurred in our western heritage with current issues facing agricultural economists. Challenges are made in relation to conflict of interest policies, external funding, cultivating connections with experts outside our discipline, and relevance of research priorities. Survey data on research priorities of upper administrators and faculty within colleges of agriculture are compared to those of Western Agricultural Economics Association members. Upper administrators from land grant colleges rank research focused in the area of competitiveness and profitability less than areas of water usage, food safety, renewable energy, global climate change, or sustainability. |
| Tipo: Article |
Palavras-chave: Academic areas; Conflict of interest disclosure; External funds; Research priorities; Teaching/Communication/Extension/Profession. |
| Ano: 2011 |
URL: http://purl.umn.edu/119156 |
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| Tronstad, Russell. |
| Farm size and production costs are varied in a six state variable stochastic dynamic programming model that quantifies monthly hedging, storage, and cash cotton sale decisions for an Alabama cotton producer. State variables considered are: (1) cash cotton price; (2) basis level; (3) before-tax income level; (4) cotton holdings; (5) futures position; and (6) value of futures position. Results indicate that when farm size and production cost level differ, marketing decisions diverge the most for cash cotton sales at the end of the tax year and lower range of cash price (less than $.65/lb.), basis (less than- $.05/lb.), and before-tax income (less than $0.00) states. |
| Tipo: Journal Article |
Palavras-chave: Demand and Price Analysis. |
| Ano: 1991 |
URL: http://purl.umn.edu/30287 |
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| Registros recuperados: 16 | |
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