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 42 for “"Sampling bias"”.
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An investigation into the sampling bias of Argo profiling floats in the Southern Ocean
… spatial and temporal distribution and potential sampling bias of Argo profiling floats brought on by the effects of bathymetric steering of currents, as well as oceanic features, such as meanders and eddies, that affect their distribution over the global ocean. This study investigates the …
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Faunal variation and its potential for sampling bias in the Morgarts Beach Member of the Yorktown Formation (Pliocene)
… of this study were to examine potential sampling problems and biases inherent in paleontological research. This has been accomplished by statistically testing for the homogeneity, or lack thereof, in species assemblages obtained from samples collected from three localities within the …
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Active Learning with Combinatorial Coverage
… transferred to new models as well as issues with sampling bias. Both issues are of crucial concern in machine learning deployment. We propose active learning methods utilizing Combinatorial Coverage to overcome these issues. The proposed methods are data-centric, and through our experiments we …
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Methodological advancements for improving performance and generating ensemble ecological niche models
… data with the aim of reducing overfitting to sampling bias in ecological niche models (ENMs). Sampling bias in geographic space leads to localities that may also be biased in environmental space. If so, the model can overfit to those biases. As a preliminary test addressing this issue, we used …
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"MODEL COMPLEXITY AND VARIABLE SELECTION IN MAXENT NICHE MODELS: ANALYSES FOR RODENTS IN MADAGASCAR"
… of modeling assumptions (e.g., representative sampling). Critical in resolving these issues is a better understanding of the effectiveness of model selection techniques. Here, I compare two strategies for optimizing ENMs: an information-criterion approach (AICc) and a sequential approach that …
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Active learning for data streams.
… challenge associated with AL, in general, is the sampling bias where the sampled training set does not reflect on the underlying data distribution. In presence of concept drift, sampling bias is more likely to occur as the training set needs to represent the underlying distribution of the evolving …
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Epistasis and Other Factors Influencing the Detection of Marker-Qtl Associations
… to epistasis and low trait heritabilities, and sampling bias.
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Use of Geospatial Methods to Characterize Dispersion of the Emerald Ash Borer in Southern Ontario, Canada
… autocorrelation on the EAB data as a result of sampling bias was addressed by applying a filtering distance threshold. To analyze the impact of environmental and anthropogenic predictors on the distribution of the EAB, logistic regression, Random Forest (RF) and a hybrid of Random Forest and GLM …
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Evaluation of a College Reading Course By Comparing Grade Point Average and Attrition Among College Freshmen
… the results may have been skewed by a possible sampling bias in which nonparticipants seemed to have an academic advantage over the participants. A need for further study was indicated.
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Coherent Scatter Computed Tomography for Core Composition Analysis of Intact Kidney Stones - Prospective Clinical Study
… a clinical perspective, they may also be, due to sampling bias, prone to missing the core components from the analysis. This work shows that coherent scatter computed tomography (CSCT) is a composition-imaging, laboratory method able to provide both composition analysis of intact calculi and a …
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Social skills training for individuals with schizophrenia: Evaluation of treatment outcome and acquisition of social and cognitive skills.
… provided in this study. Limitations such as a sampling bias and small study size are also considered as possible explanations for the pattern of findings. Clinical and research implications are discussed to apply and extend the current findings.
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Spatial distribution of anuran assemblages from Caxiuanã, Brazil : testing the riverine barrier hypothesis and the influence of life-history traits
… riverine barrier effect. After accounting for sampling bias, the present work shows that anuran composition varies throughout the studied assemblages in Caxiuanã, and that life-histories and functional traits of species likely play a larger role in small-scale diversification than the Caxiuanã …
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An Empirical Analysis of the Determinants of Initial Occupational Choice by Male High School Graduates
… procedure that corrected for self-selectivity bias. the third strategy consisted of a modified two stage logit/ordinary least squares procedure that corrected for both self-selectivity and choice-based sampling bias. The estimation results indicate that the decision to enlist is most sensitive …
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Freckled Darter (Percina lenticula) And Other Fishes’ Usage Of Wood Pile Habitat
<p>Effectively sampling habitat with the proper techniques is essential for our understanding of the animals that use the habitat, both for individual species and entire species assemblages. <em>Percina lenticula</em> is a species of special concern in the state of Mississippi due to low numbers of …
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A statistical analysis of a Haitian Mothercraft Center
… this period. But both surveys were subject to sampling bias, and no clear conclusions could be drawn. Fond Parisien Center data indicated initial age and PSW as statistically significant influences on the percentage points a child gained in his PSW (percent gain). Regression equations based on …
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When more is less : identifying biases in large Icelandic corpora
… the same sources or categories of texts, this sampling bias increases the influence of overrepresented sources - therefore, a larger dataset can lead to more bias. The Icelandic Gigaword Corpus (IGC) contains a disproportionate amount of parliament speeches and news articles, which are male …
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Quality of Life of Parental Caregivers of Children (1-36 Months) With a Tracheostomy
… via airway management clinics to avoid sampling bias. Analyses of the data using descriptive statistics and parametric testing using SPSS were performed. Although 100 participants initiated the survey 71 participants completed all the instruments. Results indicate that the parents are …
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Broadband acoustical scattering in coastal environments: application to gelatinous organisms
… backscattering is hypothesized to arise from a sampling bias caused by bubbles concentrated in the upper water column.
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Speckle applications for volumetric imaging of biological dynamics
… in speckle contrast measurements, including sampling bias due to limited statistics and detection noise from shot noise and readout noise. Next, we describe HiLo microscopy with speckle illumination, which is a previously developed wide field technique in fluorescence imaging with optical …
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