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.
Results
Showing 1 to 20 of 30 for “"Temporal dependence"”.
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Towards handling temporal dependence in concept drift streams.
… recent research suggests that the presence of temporal dependence can cause misleading evaluation when accuracy is used as the core metric. This thesis investigates temporal dependence and its negative effcts upon the classification of concept drift data. First, this thesis proposes a novel …
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Dopamine and the Temporal Dependence of Learning and Memory
… and imparted with positive valence. While the temporal requirements for associative learning have been well characterized at the behavioral level, the molecular and circuit mechanisms for this temporal sensitivity remain incompletely understood. Using the simple architecture of the mushroom …
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Spatio-Temporal Dependence of Precipitation over the Contiguous United States
… Differences between the order of spatial and temporal averaging methods are proven to be significant; therefore quantifying these differences is critical for both climate model diagnostics and downscaling applications.The second section documents spatio-temporal statistics of hourly fine-scale …
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Inference of time series regression models with weakly dependent errors
… of the size-distortion in the presence of strong temporal dependence, which is well-known in the literature. There are recently proposed bandwidth-free methods, which generally reduces the size-distortion compared to the traditional method. However, these methods still suffer from severe size …
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Misspecification testing in systems of equations
… account for the leptokurtosis and non-linear temporal dependence in the data. Using the evidence provided by preliminary data analysis as a guide, the Student’s t autoregressive model with dynamic heteroskedasticity is estimated for the log differences in three interest rate series. The …
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Using Bayesian Hierarchical Models to Study the Spatial and Temporal Distribution of Mammals in Serengeti National Park
… variables while accounting for spatial and temporal dependence. We develop a join statistic to measure the spatial dependence of data. Then we create a metric that compares the spatial clustering that exists when the data is compared at different time intervals. This shows how much the …
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Modeling “Abnormal” Ovulatory Dynamics: Enzymes, Insulin, and the Impact of Stress
… the impact of acute stress, we find temporal dependence upon ovulatory phases: early-cycle acute stress results in early ovulation, while mid-cycle acute stress delays ovulation. Finally, we replicate and experimentally expand upon clinical studies which use kisspeptin to treat …
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Macroeconomic Forecasting: Statistically Adequate, Temporal Principal Components
… of these simulations allows for the Markov (temporal) dependence inherent in macroeconomic data and serves as the basis for extending conventional PCA. Stemming from the relationship between PCA and the VAR model, an operational out-of-sample forecasting methodology is prescribed …
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From Points to Objects: Statistical Inference Beyond Euclidean Spaces
… over time, naturally raise questions about temporal dependence between successive measurements. In the third chapter, we use the additional structure present in Hadamard spaces to extend the classical autoregressive process of order one, introducing the Geodesic Autoregressive Model (GAR). …
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A study of the multivariate distribution of commodity futures prices with a view to the development of portfolios and trading systems
… normality were discovered. The multivariate temporal dependence was shown to be due to correlation between certain linear combinations of returns on contracts of differing maturities. Studying the distribution of the linear combination estimates led to the discovery that much of the observed …
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Wave boundary layer hydrodynamics and cross-shore sediment transport in the surf zone
… on assuming a certain spatial structure and temporal dependence of the eddy viscosity, is derived.
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Quantile Inference and Change Point Test under Time Series Non-stationarity
… both abrupt and smooth non-stationarity and temporal dependence. Our bootstrap procedures are shown to have certain asymptotically optimal properties in terms of accuracy and power. Our methodology is applied to the USA real GDP series, and asymmetry of structural changes in different …
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Graphical models and message passing receivers for interference limited communication systems
… wireless and powerline interference to include temporal dependence among amplitude samples. The extensions are validated with measured data. The rest of this dissertation utilizes the proposed models to design receivers in interference limited environments. Prior designs generally adopt …
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Modeling Temporal and Spatial Data Dependence with Bayesian Nonparametrics
<p>In this thesis, temporal and spatial dependence are considered within nonparametric priors to help infer patterns, clusters or segments in data. In traditional nonparametric mixture models, observations are usually assumed exchangeable, even though dependence often exists associated with the …
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Study of phonon transmission through solid-solid interfaces and superlattices by phonon imaging
… has been used to examine the angular and temporal dependence of the phonon-flux intensity in several systems, listed below. 1. Phonon focusing in cubic crystals. The nature of the intensity pattern associated with phonon propagation is examined theoretically for cubic crystals in general. …
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State-space models for stream networks
… a state-space model to describe the spatial dependence in this tree-like structure with ordering based on flow. Developing a state-space formulation permits the use of the well known Kalman recursions. Variations of the Kalman Filter and Smoother are derived for the tree-structured …
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Interaction of non-equilibrium phonons with electron-hole plasmas in germanium
… thermalization. The spatial, spectral and. temporal dependence of the recanb1nation luminescence is examined. A ""phonon wind"" force is observed to daninate the transport properties of the EHL and. the EHP. These carriers are never observed to move faster than the phonon velocity even …
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One-bit Compressed Sensing in the Presence of Noise
… the Laplacian distribution. We do not assume any temporal dependence in the signal.2. The signal exhibits temporal dependencies between signals at the current time instant and the previous time instant. The temporal dependence is modeled using the birth-death-drift (BDD) model. The …
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EFFECTS OF LEUPEPTIN ON AVERSIVELY MOTIVATED SPATIAL MEMORY
… was then used in Experiment Three to assess the temporal dependence of leupeptin's behavioral effects by introducing a delay of 1 min, 15 min, or 30 min between the information and choice trials. Leupeptin impaired choice performance at the 30 min delay only. In addition, leupeptin significantly …
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Strategic dynamic vehicle routing with spatio-temporal dependent demands
… the opposite, strategically choosing the spatio-temporal point process according to which place demands. We model the above problem and its inherent pure conflict of interests as a zero-sum game, and characterize equilibria under heavy load regime. For the analysis we discriminate between two …
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