Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"varying coefficients"”.
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Varying Coefficients in Logistic Regression with Applications to Marketing Research
… and propose a logistic regression model in which coefficients can vary based on a consumer's purchase history. We also introduce a two-step procedure for model selection that uses a group LASSO penalty to decide which are informative and which variables need varying coefficients in the model.
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Inference of high-dimensional linear models with time-varying coefficients
… for high-dimensional linear models with time-varying coefficients and dependent error processes. The method is based on a novel combination of the nonparametric kernel smoothing technique and a Lasso bias-corrected ridge regression estimator using a bias-variance decomposition to address …
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A study of differential equations possessing either time-varying coefficients or weak nonlinearities : application to an aerothermoelastic problem
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1962.
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Time-Varying Coefficient Models for Recurrent Events
I have developed time-varying coefficient models for recurrent event data to evaluate the temporal profiles for recurrence rate and covariate effects. There are three major parts in this dissertation. The first two parts propose a mixed Poisson process model with gamma frailties for single type …
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A Time Series Approach to the Prediction of Oil Discoveries
… Bayesian, multi-state (outlier/no-outlier), time varying coefficients, nonlinear time series forecasting model and applies the model to the problem of predicting oil discoveries in the North Sea and in the region of the Niger Delta.
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Essays in Economic Geography: Convergence, Inequalities and Innovations in the Knowledge Economy
… approach is used to evaluate the space-varying coefficients."
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Production frontiers and efficiency measures : concepts and applications
… other production functions have identical slope coefficients (input elasticities) but different intercepts so that they merely represent neutral shifts from one another. While some attempts have been made recently in response to the first criticism, the second one appears to have so far attracted …
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Production frontiers and efficiency measures : concepts and applications
… other production functions have identical slope coefficients (input elasticities) but different intercepts so that they merely represent neutral shifts from one another. While some attempts have been made recently in response to the first criticism, the second one appears to have so far attracted …
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QUANTITATIVE MODELING OF SCALING OF PATTERNS AND RECEPTOR SIGNALING IN MORPHOGENESIS
… paradigm with spatially varying coefficients. Our analysis revealed a number of candidate networks and minimal regulatory motifs that achieve the precision needed for a developing species to ensure perfect development. Computational models of patterning signal, namely the …
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Causal inference with time-series cross-sectional data : with applications to positive political economy
… unit-specific intercepts interacted with time-varying coefficients. It not only relaxes the often-violated "parallel trends" assumption, but also unifies the synthetic control method with linear fixed effect models under a simple framework. The second chapter examines the effect of Election Day …
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Implementation of Instantaneous Frequency Estimation based on Time-Varying AR Modeling
… Frequency (IF) estimation based on time-varying autoregressive (TVAR) modeling has been shown to perform well in practical scenarios when the IF variation is rapid and/or non-linear and only short data records are available for modeling. A challenging aspect of implementing IF estimation …
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Modeling daily electricity load curve using cubic splines and functional principal components
… real-time load, and day-ahead demand, with varying success. In this dissertation three new approaches to modeling and forecasting the 24-hour daily electricity load profiles are presented. The application of the proposed methods is illustrated using hourly electricity load data from the …
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Model-Based Vibration Diagnostic of Cracked Beams in the Time Domain
… of partial differential equations of motion with varying coefficients to account for the presence of damage. In order to provide accurate representation of the structure's behavior over a broader frequency range, a new continuous cracked beam model including shear effects and rotatory inertia is …
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Envelope tracking integral equation based hybrid electromagnetic circuit simulators
… (carriers) multiplied with complex-valued time-varying coefficients (envelopes). Unlike time-domain simulators, which sample the signals at a rate proportional to their maximum frequency content, the proposed envelope-tracking simulator samples the envelopes at a rate proportional to their …
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Evaluating Time-varying Effect in Single-type and Multi-type Semi-parametric Recurrent Event Models
… estimating the effects of time-fixed and time-varying factors in recurrent events modeling context. The research is motivated by the traffic safety research question of evaluating the influence of crash on driving risk and driver behavior. The methodologies developed, however, are general and …
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Empirical studies of convergence in income, productivity and competitiveness: the experience of Asian economies
… period of 1970-2005 using the non-linear time-varying coefficients factor model proposed by Phillips and Sul (2007a). This model has the flexibility to model a large number of transition paths to convergence, and allows for convergence clubs as well. Structural convergence exists if the …
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Essays on macroeconometrics and fiscal policy
… is passive. I estimate a Taylor rule with time-varying coefficients and use the estimated sequence of inflation parameters to inform the monetary policy regimes in a smooth-transition vector autoregression (ST-VAR) model. I then employ generalized impulse response functions (GIRFs) to estimate …
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Advancements in environmental statistics concerning multiple data sources
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Flexible models and methods for longitudinal and multilevel functional data
… methods for functional mixed effects models with varying coefficients. This work is motivated by a clinical study of Complicated Grief (Shear et al. 2005). In the Complicated Grief Study, patients receive active treatment during a treatment period and then enter a follow-up period during which …
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Enhancing rainfall measurement using microwave links at three scales
… attenuation and rainfall provided different coefficients for the power correlation between rainfall and attenuation. Regarding the variability in DSD with rainfall intensity, alterations in extinction cross-section play a role in establishing a fluid relationship between attenuation and …
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