617 research outputs found
Gender Equality in British Film-making: Research, Targets, Change
No full textThis is the author accepted manuscript. The final version is available from Palgrave Macmillan via the DOI in this recordArts and Humanities Research Council (AHRC
Clarinet quintet in A major, K. 581 ; Horn quintet in E-flat major, K. 407 ; Divertimento in D major, K. 251
No full textMore Author/Title Info: Mozart, Wolfgang Amadeus
Physical Description: 1 audio disc : digital ; 4 3/4 in.
Performers: Stanley Drucker, clarinet (1st work) ; Joseph Robinson, oboe (3rd work) ; L. William Kuyper (2nd & 3rd works), R. Allen Spanjer (3rd work), horns ; Timothy Cobb, double bass (3rd work) ; Elysium String quartet (Jennifer Tiboris, Gary Levinson, violins ; Veronica R. Salas, viola ; Lutz Rath, violoncello).
Event Details: Recorded at the American Academy of Arts and Letters, New York City, Sept. 21, Dec. 2 and 6, 1998
Fitting the Cusp Catastrophe in R: A cusp Package Primer
No full textOf the seven elementary catastrophes in catastrophe theory, the âÂÂcuspâ model is the most widely applied. Most applications are however qualitative. Quantitative techniques for catastrophe modeling have been developed, but so far the limited availability of flexible software has hindered quantitative assessment. We present a package that implements and extends the method of Cobb (Cobb and Watson'80; Cobb, Koppstein, and Chen'83), and makes it easy to quantitatively fit and compare different cusp catastrophe models in a statistically principled way. After a short introduction to the cusp catastrophe, we demonstrate the package with two instructive examples.
Efficient Estimates of a Model of Production and Cost
No full textIn 1944, Marschak and Andrews published a seminal paper on how to obtain consistent estimates of a production technology. The original formulation of the econometric model regarded the joint estimation of the production function together with the first-order necessary conditions for profit-maximizing behavior. In the seventies, with the advent of duality theory, the preference seemed to have shifted to a dual approach. Recently, however, Mundlak resurrected the primal-versus-dual debate with a provocative paper titled “Production Function Estimation: Reviving the Primal.” In that paper, the author asserts that the dual estimator, unlike the primal approach, is not efficient because it fails to utilize all the available information. In this paper we argue that efficient estimates of the production technology can be obtained only by jointly estimating all the relevant primal and dual relations. Thus, the primal approach of Mundlak and the dual approach of McElroy become nested special cases of our general specification. The theory of the price-taking cost-minimizing, risk-neutral firm is based upon the expectation of prices and quantities as the relevant information used by the entrepreneur in making her decisions. The econometrician intervenes later on and collects information about those quantities and prices. In so doing, measurement errors creep into the econometric specification. A two-phase procedure is suggested to implement the primal-dual approach. A Monte Carlo analysis indicates that our primal-dual approach produces estimates that exhibit a smaller variance of the estimates than those obtained from either the traditional primal or the dual specification separately implemented. A bootstrapping approach is used to compute the standard errors of the model’s estimates.Primal, Dual, Cobb-Douglas, Nonlinear errors-in-variables, Productivity Analysis, Research Methods/ Statistical Methods, D0, C3,
A Nonlinear Generalized Additive Error Model of Production and Cost
No full textIn 1944, Marschak and Andrews published a seminal paper on how to obtain consistent estimates of a production technology. The original formulation of the econometric model regarded the joint estimation of the production function together with the first-order necessary conditions for profit-maximizing behavior. In the seventies, with the advent of econometric duality, the preference seemed to have shifted to a dual approach. Recently, however, Mundlak resurrected the primal-versus-dual debate with a provocative paper titled “Production Function Estimation: Reviving the Primal.” In that paper, the author asserts that the dual estimator, unlike the primal approach, is not efficient because it fails to utilize all the available information. In this paper we demonstrate that efficient estimates of the production technology can be obtained only by jointly estimating all the relevant primal and dual relations. Thus, the primal approach of Mundlak and the dual approach of McElroy become nested special cases of the general specification. In the process of putting to rest the primal-versus-dual debate, we solve also the nonlinear errors-in-variables problem when all the variables are measured with error.Primal, Dual, Cobb-Douglas, Nonlinear errors-in-variables, Productivity Analysis, Research Methods/ Statistical Methods, D0, C3,
Redescription of Chroniodiplogaster aerivora (Cobb) gen. n., comb. n. (Rhabditida: Diplogasteridae) from Termites
No full textABSTRACT: The nematode originally described as Diplogaster aerivora by Cobb is redescribed in the new genus Chroniodiplogaster. Diagnostic characters of the new genus include (1) the presence of 9 genital papillae, 3 of which are closely associated in a triplet set at the base of the tail, (2) 2 separate bursae, 1 which extends ventrolaterally along the tail, and the second, which is associated with the triplet papillae, and (3) a dorsal metarhabdion with a large mobile tooth and subventral metarhabdions with variably sized teeth. Dauer stages of C. aerivora occurred in the heads of worker termites of Reticulitermes tibialis. On occasion, the nematodes would enter the body cavity and kill the termites. KEY WORDS: Chroniodiplogaster aerivora gen. n., comb, n., Diplogasteridae, Rhabditida, Nematoda, termite, parasite. In 1916, Cobb described Diplogaster labiata and Diplogaster aerivora in a paper by Recognition of M. aerivora is made difficult by the absence of detailed illustrations and quantitative data in the original description. Neither Weingartner (1955) nor Goodey (1963) treated M. aerivora in their taxonomic presentation of the family Diplogasteridae and the species M. aerivora has been treated under the genera Diplogaster, Micoletzkya, and Pristionchus. After a detailed morphological study of M. aerivora, the present author redescribes the species and places it in a new genus, Chroniodiplogaster. Materials and Methods Populations of M. aerivora studied here were isolated from the heads of worker termites (R. tibialis) (Banks) in Colorado in 1987 by John L. Capinera. They were maintained on nutrient agar plates and taxonomic studies were made on adults and dauer juveniles removed from these cultures. All nematodes were killed in hot (55°C) water, fixed in TAP, and processed to glycerin for measurements and drawings. Four of Cobb's original slides (nos. 1-4) containing adult male and female M. aerivora were received from A. Morgan Golden, Nematology Laboratory, U.S. Dept. of Agriculture, Beltsville, Maryland, for comparative purpos- Results Populations of nematodes removed from the heads of R. tibialis in Colorado agreed with the description of M. aerivora by Cobb (in Merrill and Ford, 1916) and were similar to Cobb's original specimens of M. aerivora. Therefore the Colorado population was considered to be M. aerivora Cobb. This reexamination also revealed certain characters that made it difficult to place M. aerivora in any of the existing genera of Diplogasteridae. These characters consist of 9 pairs of genital papillae including a posterior set of 3, of which 2 are always reduced, a gubernaculum with ventral processes, which encloses the distal portion of the spicule shafts, a long narrow bursa associated with the 3 ventrolateral papillae, and a separate short bursa associated with the posterior set of 2
A Brief History of Production Functions
No full textThis paper gives an outline of evolution of the concept and econometrics of production function, which was one of the central apparatus of neo-classical economics. It shows how the famous Cobb-Douglas production function was indeed invented by von Thunen and Wicksell, how the CES production function was formulated, how the elasticity of substitution was made a variable and finally how Sato’s function incorporated biased technical changes. It covers almost all specifications proposed during 1950-1975, and further the LINEX production functions and incorporation of energy as an input. The paper in divided into (1) single product functions, (2) joint product functions, and (3) aggregate production functions. It also discusses the ‘capital controversy’ and its impacts.Production function; Cobb-Douglas; CES; Transcendental; translog; Zellner-Revankar; VES; Bruno; Kadiyala; Diewert; Kummel; Mundlak; Engineering production function; Multi-output; joint product; Data Envelopment; Household production function; Humbug production function; capital controversy; Cambridge controversy
An Allometric Algorithm for Fractal-Based Cobb-Douglas Function of Geographical Systems
No full textThe generalized Cobb-Douglas production function has been derived from a general input-output relation based on fractality assumptions. It was proved to be a useful self-affine model for geographical analysis. However, the ordinary least square calculation is always an ineffectual method for the Cobb-Douglas modeling because of the multicollinearity in the logarithmic linear regression. In this paper, a novel approach is proposed to build the geographical Cobb-Douglas models. Combining the concept of allometric scaling with the linear regression technique, we obtain a simple algorithm that can be employed to estimate the parameters of the Cobb-Douglas function. As a case, the algorithm and models are applied to the public transportation of China’s cities, and the results validate the allometric algorithm. A conclusion can be drawn that the allometric analysis is an effective way of modeling geographical systems with the general Cobb-Douglas function. This study is significant for integrating the notions of allometry, fractals, and scaling into a new framework to form a quantitative methodology of spatial analysis
Going ... Going ... Gone
No full textPhotograph used for a story in the Daily Oklahoman newspaper. Caption: "Welch Long, 18, 412 NE first, watches sadly as R. C. Stuart, president of the Fidelity National bank, counts part of the $13500 taken in Oklahoma City's bank robbery Wednesday afternoon.
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