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 20 for “"Sampling designs"”.
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Some Sampling Designs and Estimation Problems
… chapter we review some standard estimators in sampling from a finite population, and some design-based estimators in sampling from a continuous universe.</p> <p>In concert with the theory initiated by professor Douglas Robson (personal communication) and later presented by Cordy (1993), we …
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Sequential Sampling Designs for Estimating Software Reliability
… during testing is a shortcoming of a fixed sampling scheme. We applied sequential sampling schemes to make allocation decisions dynamically throughout the testing process. Under these sampling schemes, we can refine the allocation of test cases sequentially based on the information gained as …
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ASSESSING THE PERFORMANCE OF SAMPLING DESIGNS FOR MEASURING ABUNDANCE OF UNDERSTORY PLANTS AFTER FOREST RESTORATION
… disturbance may be hampered by inappropriate sampling methodologies. Conventional methods for sampling understory plants may be robust for common, well-distributed species, but may fail to adequately characterize the abundance of less-common species, which are often the taxa of management …
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ASSESSING THE PERFORMANCE OF SAMPLING DESIGNS FOR MEASURING ABUNDANCE OF UNDERSTORY PLANTS AFTER FOREST RESTORATION
… disturbance may be hampered by inappropriate sampling methodologies. Conventional methods for sampling understory plants may be robust for common, well-distributed species, but may fail to adequately characterize the abundance of less-common species, which are often the taxa of management …
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Characterizing bias, precision, and sampling efficiency of commonly used electrofishing sampling designs in midwestern lentic systems
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Techniques for Estimating the Variance of Specific Estimators within Complex Surveys
… obtained from different types of survey designs, leading up to more advanced designs such complex surveys. The thesis starts with defining the various sampling designs that are to be used for illustrations (Ch 2). Chapter two gives further descriptions of how various sampling designs are …
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The use of auxiliary information in the linear least-squares prediction approach to cluster sampling in a finite population
… methods are applied to cluster (two-stage) sampling problems in a finite population where auxiliary information is available. Two regression models which describe the behavior of the second-stage units and which utilize the auxiliary information are considered. For one model the optimum …
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Spatial and temporal population dynamics of yellow perch (Perca flavescens) in Lake Erie
… used approach in Lake Erie is stratified random sampling (StRS). Traditional sampling designs (simple random sampling (SRS) and StRS) and adaptive sampling designs (adaptive two-phase sampling (ATS), adaptive cluster sampling (ACS), and adaptive two-stage sequential sampling (ATSS)) for …
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Minimum tree height sample sizes necessary for accurately estimating merchantable plot volume in Loblolly pine plantations
… of volume estimation techniques and sample designs examined in this study. The volume estimation techniques examined in this study were: 1) a volume equation using measured tree diameters and either measured heights or height estimates obtained from a plot height-diameter relationship, 2) a …
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Food Shelf Life: Estimation and Experimental Design
… are usually selected adaptively using ‘staggered sampling.’ Ad-hoc methods based on linear regression have been recommended to estimate shelf life. However, other methods based on maximizing a likelihood (MLE) have been proposed, studied, and used. Both methods assume the Weibull distribution. The …
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Assessing the impacts of white-nose syndrome induced mortality on the monitoring of a bat community at Fort Drum Military Installation
… 2011 and 2012, I implemented intensive acoustic sampling using Anabat detectors at Fort Drum to develop a summer acoustic monitoring protocol that is both cost efficient and effective at detecting species of high conservation or management interest, such as the Indiana bat and the little brown …
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Improving Survey Methodology Through Matrix Sampling Design, Integrating Statistical Review Into Data Collection, and Synthetic Estimation Evaluation
… stage by proposing a method of developing matrix sampling designs, a design where a subset of questions are administered to a respondent in such a way that the administered questions are predictive of the omitted questions. The proposed methodology compares favorably to previous methods when …
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Benthic metrics as indicators of human disturbance in a marine-dominated lagoon
… important baseline data relevant to optimizing sampling designs for detecting human disturbance impacts in Langebaan Lagoon. Key Words: Benthic metrics, bioindicator, macrobenthos, disturbance, trampling, coastal lagoon.
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Efficient Sampling Methods for Forest Inventories and Growth Projections
… With time and costs constraints, appropriate sampling designs and models are required to perform the inventory efficiently, as well as to obtain reliable estimates for the variables needed to make projections. In this dissertation research, a simulation study was conducted to extensively …
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Saturated hydraulic conductivity in the humid tropics : sources of variability, implications for monitoring and effects on near-surface hydrological flow paths
… years. The process was limited to the 0−6 cm sampling depth and showed large variability among replicates. A wavelet analysis of a Ks transect crossing different soil map units under comparable land cover, old-growth tropical rainforest, showed large small-scale variability, which was …
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Statistical modeling of longitudinal survey data with binary outcomes
… longitudinal surveys using complex multi-stage sampling designs contain cross-sectional dependencies among units caused by inherent hierarchies in the data, and within subject correlation arising due to repeated measurements. The statistical methods used for analyzing such data should account …
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Representation Learning Based Causal Inference in Observational Studies
… reasoning with unobserved confounding or biased sampling designs become feasible. The effectiveness of this new proposal is verified with respect to a variety of study designs on real and synthetic data. In summary, this dissertation presents a flexible causal inference framework that …
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Using population ecology to inform the conservation of Nevada's rare plants
… approaches have attempted this by altering sampling designs to account for heterogeneity, however model-based approaches could also be useful to estimate population size of heterogeneously distributed species but have so far not been examined. In chapter 1, I tested the ability of a …
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Sampling strategies for forest aerial detection survey in Colorado
… my dissertation was to identify an appropriate sampling strategies to archive good estimates of total area damaged, to decrease survey cost, and to increase safety by reducing the amount of flights. To approach this goal, four sample designs for estimating total area damaged caused by various …
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Dynamics of baseline stable isotopes within a temperate coastal ecosystem: Relationships and projections using physical and biogeochemical factors
… different patterns of variation, show that sampling designs need to be compatible to the research questions of interest. Otherwise, improper allocation of sampling effort may decrease the probability of detecting ecologically important differences. Consequently, my results provide a …