30,027 research outputs found
Albert E. J. Engel Interview, February 28, 1989
No full textAlbert E. J. Engel recalls his childhood adventures in the Missouri Ozarks, which led to his interest in geology. He acknowledges Arthur Buddington as his greatest influence in the field and describes working with Buddington at Princeton University. Engel discusses working with his geochemist wife, Celeste Engel, throughout his career and notes their love of Montana and their decision to retire in the Bitterroot Valley. Engel details how the development of plate tectonic theory dramatically changed the field of geology. He explains that his transition from petrology to hydrology was informed by desire to study the movement of groundwater in Montana. Engel talks at length about climate change, pollution, and overpopulation. He also credits Thomas M. Power of the University of Montana’s Department of Economics with studying the financial benefits of Montana’s tourist industry in comparison with the environmental and economic costs of mining activities in the state.https://scholarworks.umt.edu/umhistory_interviews/1019/thumbnail.jp
Study of Jacques Bachrach a Dunera boy, Tatura, Victoria, 1942 /
No full textTitle devised by cataloguer based on inscription.; Part of the collection: Portraits of Dunera Boys, 1941-1943.; Inscriptions: "J. Bachrach"--In pencil on reverse; "Theodor Engel, Tatura 42"--In pencil lower right.; Condition: Pin holes.; Also available online at: http://nla.gov.au/nla.pic-vn6255292
Quadratic engel curves and consumer demand
No full textThis paper presents a model of consumer demand that is consistent with the observed expenditure patterns of individual consumers in a long time series of expenditure surveys and is also able to provide a detailed welfare analysis of shifts in relative prices. A nonparametric analysis of consumer expenditure patterns suggests that Engel curves require quadratic terms in the logarithm of expenditure. While popular models of demand such as the Translog or the Almost Ideal Demand Systems do allow flexible price responses within a theoretically coherent structure, they have expenditure share Engel curves that are linear in the logarithm of total expenditure. We derive the complete class of integrable quadratic logarithmic expenditure share systems. A specification from this class is estimated on a large pooled data set of U.K. households. Models that fail to account for Engel curvature are found ro generate important distortions in the patterns of welfare losses associated with a tax increase
Comparing shapes of engel curves
No full textWe measure how different the shapes of Engel curves are across 59 commodity groups. The same analysis is carried out for their derivatives and variances. While Engel curves possess a relatively homogeneous shape, significantly more heterogeneity is present in derivatives and when particular sub-classes of income are considered.Consumption, Kernel smoothing, Rank correlation, Curve shape
DEMAND SYSTEM CHOICE BASED ON TESTING THE ENGEL CURVE SPECIFICATION
No full textIt is common to use a demand systems approach in estimating the key parameters from household consumption data. In conducting these studies the researcher is faced with selecting a functional form. In turn, each functional form implies a particular shape for the Engel curves. This analysis highlights the importance of testing the shape of Engel curves, especially if the researcher is interested in elasticity estimates well away from the sample mean. Using consumption data for selected households in Italy it is shown that many popular functional forms are rejected by the data.Demand and Price Analysis,
Nonparametric IV estimation of shape-invariant Engel curves
No full textThis paper concerns the identification and estimation of a shape-invariant Engel
curve system with endogenous total expenditure. The shape-invariant specification
involves a common shift parameter for each demographic group in a pooled
system of Engel curves. Our focus is on the identification and estimation of both
the nonparametric shape of the Engel curve and the parametric specification of the
demographic scaling parameters. We present a new identification condition, closely
related to the concept of bounded completeness in statistics. The estimation procedure
applies the sieve minimum distance estimation of conditional moment restrictions
allowing for endogeneity. We establish a new root mean squared convergence
rate for the nonparametric IV regression when the endogenous regressor has unbounded
support. Root-n asymptotic normality and semiparametric efficiency of
the parametric components are also given under a set of ‘low-level’ sufficient conditions.
Monte Carlo simulations shed lights on the choice of smoothing parameters
and demonstrate that the sieve IV estimator performs well. An application is made
to the estimation of Engel curves using the UK Family Expenditure Survey and
shows the importance of adjusting for endogeneity in terms of both the curvature
and demographic parameters of systems of Engel curves
Nonparametric IV estimation of shape-invariant Engel curves
No full textThis paper concerns the identification and estimation of a shape-invariant Engel curve system with endogenous total expenditure. The shape-invariant specification involves a common shift parameter for each demographic group in a pooled system of Engel curves. Our focus is on the identification and estimation of both the nonparametric shape of the Engel curve and the parametric specification of the demographic scaling parameters. We present a new identification condition, closely related to the concept of bounded completeness in statistics. The estimation procedure applies the sieve minimum distance estimation of conditional moment restrictions allowing for endogeneity. We establish a new root mean squared convergence rate for the nonparametric IV regression when the endogenous regressor has unbounded support. Root-n asymptotic normality and semiparametric efficiency of the parametric components are also given under a set of Ѭow-level' sufficient conditions. Monte Carlo simulations shed lights on the choice of smoothing parameters and demonstrate that the sieve IV estimator performs well. An application is made to the estimation of Engel curves using the UK Family Expenditure Survey and shows the importance of adjusting for endogeneity in terms of both the curvature and demographic parameters of systems of Engel curves.
Oligochlora grimaldii Engel 1997
No full text<i>Oligochlora grimaldii</i> Engel <p> <i>Oligochlora grimaldii</i> Engel, 1997: 98; Engel, 2001: 176.</p> <p> <b>New material.</b> ♀; KU-DR-020; amber from the Dominican Republic (specific mine unknown), Early Miocene (Burdigalian); Fossil Insect Collection, Division of Entomology, University of Kansas Natural History Museum, Lawrence, Kansas, USA.</p> <p> <b>Tribe Caenohalictini Michener</b></p>Published as part of <i>Engel, Michael, 2009, Two New Halictine Bees in Miocene Amber from the Dominican Republic (Hymenoptera, Halictidae), pp. 1-12 in ZooKeys 29 (29)</i> on page 6, DOI: 10.3897/zookeys.29.257, <a href="http://zenodo.org/record/576571">http://zenodo.org/record/576571</a>
An Engel Curve Analysis of Household Expenditure in Taiwan: 1996-98
No full textSeven systems of Engel curves for expenditures on ten commodity groups were estimated using Taiwanese household expenditure data for the period from 1996 through 1998. Results show that the estimated expenditure elasticities are insensitive to the choice of functional forms.Engel curve, Taiwan, Consumer/Household Economics,
Gottschea isotachyphylla J. J. Engel
No full text<p> <i>Gottschea isotachyphylla</i> (J.J.Engel et R.M.Schust.) J.J.Engel,</p> <p> <i>Nova Hedwigia</i> 93 (3–4): 407, 2011 (see Engel 2011). BASIONYM: <i>Paraschistochila isotachyphylla</i> J.J.Engel et R.M.Schust., <i>J. Hattori Bot. Lab.</i> 58: 429, 1985 (see Schuster & Engel 1985).</p>Published as part of <i>Söderström, Lars, Hagborg, Anders & Konrat, Matt Von, 2014, Early Land Plants Today: Index of Liverworts & Hornworts 2011 - 2012, pp. 61-85 in Phytotaxa 170 (2)</i> on page 69, DOI: 10.11646/phytotaxa.170.2.1, <a href="http://zenodo.org/record/4779611">http://zenodo.org/record/4779611</a>
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