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Simultaneous Data-Based Optimization Of A 1d-Ecosystem Model At Three Locations In The North Atlantic: Part I—Method And Parameter Estimates, Markus Schartau, Andreas Oschlies Jan 2003

Simultaneous Data-Based Optimization Of A 1d-Ecosystem Model At Three Locations In The North Atlantic: Part I—Method And Parameter Estimates, Markus Schartau, Andreas Oschlies

Journal of Marine Research

An optimization experiment is performed with a vertically resolved, nitrogen-based ecosystem model, composed of four state variables (NPZD-model): dissolved inorganic nitrogen (N), phytoplankton (P), herbivorous zooplankton (Z) and detritus (D). Parameter values of the NPZD-model are optimized while assimilating observations at three locations in the North Atlantic simultaneously, namely at the sites of the Bermuda Atlantic Time-Series Study (BATS; 31N 64W), of the North Atlantic Bloom Experiment (NABE; 47N 20W), and of Ocean Weather Ship-India (OWS-INDIA; 59N 19W). A method is described for a simultaneous optimization which effectively merges …

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Evaluation Of Excess 234th Activity In Sediments As An Indicator Of Food Quality For Deep-Sea Deposit Feeders, Amanda W. J. Demopoulos, Craig R. Smith, David J. Demaster, William L. Fornes Jan 2003

Evaluation Of Excess 234th Activity In Sediments As An Indicator Of Food Quality For Deep-Sea Deposit Feeders, Amanda W. J. Demopoulos, Craig R. Smith, David J. Demaster, William L. Fornes

Journal of Marine Research

Deep-sea deposit feeders selectively ingest large volumes of sediment. Knowledge of the nature of this selectivity will help to elucidate the limiting nutritional requirements and geochemical impacts of these abundant animals. Shallow-water and theoretical studies suggest that deep-sea deposit feeders should select particles rich in protein, bacterial biomass, and/or chloropigment concentrations. Recent studies indicate that deep-sea megafaunal deposit feeders exhibit strong gut enrichment of excess (xs) 234Th activity, even though 234Thxs lacks nutritional value. To explore the significance of selective ingestion of 234Thxs activity, we evaluated the correlations between 234Thxs activity and three …

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Tests Of Independence In Separable Econometric Models: Theory And Application, Donald J. Brown, Rahul Deb, Marten H. Wegkamp Jan 2003

Tests Of Independence In Separable Econometric Models: Theory And Application, Donald J. Brown, Rahul Deb, Marten H. Wegkamp

Cowles Foundation Discussion Papers

A common stochastic restriction in econometric models separable in the latent variables is the assumption of stochastic independence between the unobserved and observed exogenous variables. Both simple and composite tests of this assumption are derived from properties of independence empirical processes and the consistency of these tests is established. As an application, we simulate estimation of a random quasilinear utility function, where we apply our tests of independence.

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Gmm Estimation Of Autoregressive Roots Near Unity With Panel Data, Hyungsik Roger Moon, Peter C.B. Phillips Jan 2003

Gmm Estimation Of Autoregressive Roots Near Unity With Panel Data, Hyungsik Roger Moon, Peter C.B. Phillips

Cowles Foundation Discussion Papers

This paper investigates a generalized method of moments (GMM) approach to the estimation of autoregressive roots near unity with panel data and incidental deterministic trends. Such models arise in empirical econometric studies of firm size and in dynamic panel data modeling with weak instruments. The two moment conditions in the GMM approach are obtained by constructing bias corrections to the score functions under OLS and GLS detrending, respectively. It is shown that the moment condition under GLS detrending corresponds to taking the projected score on the Bhattacharya basis, linking the approach to recent work on projected score methods for models …

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Jackknifing Bond Option Prices, Peter C.B. Phillips, Jun Yu Jan 2003

Jackknifing Bond Option Prices, Peter C.B. Phillips, Jun Yu

Cowles Foundation Discussion Papers

In continuous time specifications, the prices of interest rate derivative securities depend crucially on the mean reversion parameter of the associated interest rate diffusion equation. This parameter is well known to be subject to estimation bias when standard methods like maximum likelihood (ML) are used. The estimation bias can be substantial even in very large samples and it translates into a bias in pricing bond options and other derivative securities that is important in practical work. The present paper proposes a very general method of bias reduction for pricing bond options that is based on Quenouille’s (1956) jackknife. We show …

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Vision And Influence In Econometrics: John Denis Sargan, Peter C.B. Phillips Jan 2003

Vision And Influence In Econometrics: John Denis Sargan, Peter C.B. Phillips

Cowles Foundation Discussion Papers

Denis Sargan’s intellectual influence in econometrics is discussed and some of his visions for the future of econometrics are considered in this memorial article. One of Sargan’s favorite topics in econometric theory was finite sample theory, including both exact theory and various types of asymptotic expansions. We provide some summary discussion of asymptotic expansions of the type that Sargan developed in this field and give explicit representations of Sargan’s formula for the Edgeworth expansion in the case of an econometric estimator that can be written as a smooth function of sample moments whose distributions themselves have Edgeworth expansions.

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Tests Of Independence In Separable Econometric Models: Theory And Application, Donald J. Brown, Rahul Deb, Marten H. Wegkamp Jan 2003

Tests Of Independence In Separable Econometric Models: Theory And Application, Donald J. Brown, Rahul Deb, Marten H. Wegkamp

Cowles Foundation Discussion Papers

A common stochastic restriction in econometric models separable in the latent variables is the assumption of stochastic independence between the unobserved and observed exogenous variables. Both simple and composite tests of this assumption are derived from properties of independence empirical processes and the consistency of these tests is established. As an application, we simulate estimation of a random quasilinear utility function, where we apply our tests of independence.

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Optimized Endoscopic Repair Of The Traumatized Facial Skeleton : Cranial Nerve Vii Region, Matthew Stiebel Jan 2003

Optimized Endoscopic Repair Of The Traumatized Facial Skeleton : Cranial Nerve Vii Region, Matthew Stiebel

Yale Medicine Thesis Digital Library

No abstract provided.

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Correlation Of Dynamic Contrast Enhanced Mri Imaging Characteristics With Gene Expression Profiles In Renal Cell Carcinoma, Essmaeel Hussein Abdel-Dayem Jan 2003

Correlation Of Dynamic Contrast Enhanced Mri Imaging Characteristics With Gene Expression Profiles In Renal Cell Carcinoma, Essmaeel Hussein Abdel-Dayem

Yale Medicine Thesis Digital Library

No abstract provided.

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Trends In Seclusion And Restraint Use : A Naturalistic Study Of Psychiatrically Hospitalized Youths, Abigail Louise Donovan Jan 2003

Trends In Seclusion And Restraint Use : A Naturalistic Study Of Psychiatrically Hospitalized Youths, Abigail Louise Donovan

Yale Medicine Thesis Digital Library

No abstract provided.

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Proper Coronary Vascular Development And Heart Morphogenesis Depend On Interaction Of Gata-4 With Fog Cofactors, Maya Beth Lodish Jan 2003

Proper Coronary Vascular Development And Heart Morphogenesis Depend On Interaction Of Gata-4 With Fog Cofactors, Maya Beth Lodish

Yale Medicine Thesis Digital Library

No abstract provided.

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The Effect Of Cholesterol-Related Knowledge On Patients' Ability To Reach Target Cholesterol Levels, Jeffrey A. Seiden Jan 2003

The Effect Of Cholesterol-Related Knowledge On Patients' Ability To Reach Target Cholesterol Levels, Jeffrey A. Seiden

Yale Medicine Thesis Digital Library

No abstract provided.

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When And Why Physicians Deceive : Interactions With Third-Party Payers, David Erik Geist Jan 2003

When And Why Physicians Deceive : Interactions With Third-Party Payers, David Erik Geist

Yale Medicine Thesis Digital Library

No abstract provided.

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The Political Economy Of Reconstruction Finance Corporation Assistance During The Great Depression, Joseph R. Mason Jan 2003

The Political Economy Of Reconstruction Finance Corporation Assistance During The Great Depression, Joseph R. Mason

Documents

No abstract provided.

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Bank Negara Malaysia Annual Report 2003, Bank Negara Malaysia/Central Bank Of Malaysia Jan 2003

Bank Negara Malaysia Annual Report 2003, Bank Negara Malaysia/Central Bank Of Malaysia

Documents

No abstract provided.

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Securum And The Way Out Of The Swedish Banking Crisis, Clas Bergstr¶M, Peter Englund, Per Thorell Jan 2003

Securum And The Way Out Of The Swedish Banking Crisis, Clas Bergstr¶M, Peter Englund, Per Thorell

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No abstract provided.

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Firms And Their Distressed Banks: Lessons From The Norwegian Banking Crisis, Steven Ongena, Dag Michalsen, David C. Smith Jan 2003

Firms And Their Distressed Banks: Lessons From The Norwegian Banking Crisis, Steven Ongena, Dag Michalsen, David C. Smith

Documents

No abstract provided.

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Moodys Follow Up Exhibits- Structured Finance Ratings Part A, Julia Tung Jan 2003

Moodys Follow Up Exhibits- Structured Finance Ratings Part A, Julia Tung

Documents

No abstract provided.

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On The Role Of Biological Dynamics In Plankton Patchiness At The Mesoscale: An Example From The Eastern North Atlantic Ocean, M. A. Srokosz, A. P. Martin, M. J. R. Fasham Jan 2003

On The Role Of Biological Dynamics In Plankton Patchiness At The Mesoscale: An Example From The Eastern North Atlantic Ocean, M. A. Srokosz, A. P. Martin, M. J. R. Fasham

Journal of Marine Research

In situations where the direct physical forcing of biological processes, through nutrient supply or light limitation of phytoplankton, does not show significant spatial variability, it is demonstrated that the effects of the mesoscale circulation and population dynamics on plankton patchiness are in principle, separable. In this case, the physical stirring and mixing control the size and shape of structures seen in plankton distributions, whilst the biological dynamics controls the size of the populations within those structures. This is demonstrated using field observations and a simple process model. The field data, which come from mesoscale surveys of a region (16 -20W, …

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From The Front Lines At Seoul Bank: Restructuring And Reprivatization, Chungwon Kang Jan 2003

From The Front Lines At Seoul Bank: Restructuring And Reprivatization, Chungwon Kang

Documents

No abstract provided.

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The Unholy Trinity Of Financial Contagion, Graciela L. Kaminsky, Carmen M. Reinhart, Carlos A. Vegh Jan 2003

The Unholy Trinity Of Financial Contagion, Graciela L. Kaminsky, Carmen M. Reinhart, Carlos A. Vegh

Documents

No abstract provided.

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Adaptive Model Of Dom Dynamics In The Surface Ocean, Markus Pahlow, Alain F. Vézina Jan 2003

Adaptive Model Of Dom Dynamics In The Surface Ocean, Markus Pahlow, Alain F. Vézina

Journal of Marine Research

The bulk of marine dissolved organic matter (DOM) forms a large, old, refractory carbon pool in the deep ocean, yet a small fraction in the surface ocean is actively involved in the global carbon cycle and may contribute significantly to the biological pump. We argue that present models of plankton and DOM in the surface ocean are incompatible with current knowledge of marine DOM dynamics. We present a plankton model with an adaptive formulation of bacteria-DOM interactions which is more consistent with observations. Our model reproduces net accumulation of DOM and is the first to reconcile the prevailing reports of …

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Developing Anti-Cd30 Recombinant Immunotoxins Targeting Shed And Non-Shed Epitopes For Cancer Therapy, Abhishek Sinha Jan 2003

Developing Anti-Cd30 Recombinant Immunotoxins Targeting Shed And Non-Shed Epitopes For Cancer Therapy, Abhishek Sinha

Yale Medicine Thesis Digital Library

No abstract provided.

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The Imf And Recent Capital Account Crises: Indonesia, Korea, Brazil, International Monetary Fund (Imf) Jan 2003

The Imf And Recent Capital Account Crises: Indonesia, Korea, Brazil, International Monetary Fund (Imf)

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No abstract provided.

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Implementation Completion Report (Fslt-70000) On A Loan And A Policy Based Guarantee In The Amount Of Us$ 505.6 Million Equivalent To The Republic Of Colombia, World Bank/World Bank Group Dec 2002

Implementation Completion Report (Fslt-70000) On A Loan And A Policy Based Guarantee In The Amount Of Us$ 505.6 Million Equivalent To The Republic Of Colombia, World Bank/World Bank Group

Documents

No abstract provided.

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Effects Of Brain Region And Gender On Proton Magnetic Resonance Spectroscopy In Normal Subjects, Marlyanne Pol-Rodriguez Dec 2002

Effects Of Brain Region And Gender On Proton Magnetic Resonance Spectroscopy In Normal Subjects, Marlyanne Pol-Rodriguez

Yale Medicine Thesis Digital Library

The purpose of this study was to acquire spectra using proton magnetic resonance spectroscopy (MRS) with a long echo time (TE) to measure clinically important brain metabolites in normal subjects. We aimed to determine whether these metabolites vary across brain regions and between men and women. The results of this study will constitute a normative database that will be used as a reference for MRS studies of patients with neurological disease. Single voxel proton (1H) spectra were acquired in seventy-two subjects ranging in age from twenty to forty-four years. Ten brain regions were examined. Six gray matter sites in the …

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Testing For A New Economy In The 1990s, Ray C. Fair Dec 2002

Testing For A New Economy In The 1990s, Ray C. Fair

Cowles Foundation Discussion Papers

This paper examines how much structural change there was in the U.S. economy in the last half of the 1990s. The results are consistent with the hypothesis that there was only one major structural change, namely the huge increase in stock prices relative to earnings. All other large changes can be explained by this change. There is no obvious reason for the large increase in stock prices relative to earnings. Increased productivity growth does not appear to be an answer since the data show that there was only a modest increase in long run productivity growth in the last half …

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Program For Financial Revival, Government Of Japan: Financial Services Authority Oct 2002

Program For Financial Revival, Government Of Japan: Financial Services Authority

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No abstract provided.

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Thailand's Emergence From The Crisis – New Paradigm For Sustainable Growth, Pridiyathorn Devakula Oct 2002

Thailand's Emergence From The Crisis – New Paradigm For Sustainable Growth, Pridiyathorn Devakula

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No abstract provided.

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Govenor Ben S. Bernanke Speech, Asset-Price Bubbles And Monetary Policy, Ben S. Bernanke Oct 2002

Govenor Ben S. Bernanke Speech, Asset-Price Bubbles And Monetary Policy, Ben S. Bernanke

Documents

No abstract provided.

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