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 40 for “"sample design"”.
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The Effects of Sample Design and Measure Reliability on Lisrel-Based Hypothesis Tests
This report describes how sample design and measure reliability affect the power of hypothesis tests from LISREL's maximum Likelihood ratio. Using simulation data and data from the High School and Beyond survey (HSB), I show that test power decreases when sample design differs from an unrestricted …
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Sampling strategies for forest aerial detection survey in Colorado
… amount of flights. To approach this goal, four sample designs for estimating total area damaged caused by various causal agent were evaluated: simple random sampling, stratified random sampling, probability proportional to size, and non-alignment systematic sampling. A GIS layer of 150 transects …
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Electromagnetic Steering of Sodium-Seeded Rocket Thrust Plumes: Design & Analysis
… force component thus generated, for the sample design used is estimated at 0.002% without sodium seeding, and 3.5% with said seeding. The design of a prototype thruster is undertaken, burning gaseous propane and oxygen, resulting in a combustion chamber, expansion nozzle, and a magnetic …
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The mathematical-statistical methodology of the contemporary Soviet family budget survey
… Family Budget Survey, both in regard to the sample design and in regard to the processing and analysis of the survey data. A wide range of methodological deficiencies are identified, accounting for the widely recognised unreliability of the data produced. The problems of using the survey data …
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Assessing petrified wood change in Petrified Forest National Park
… time period. Line intersect sampling was used to sample three size classes of petrified wood along with fixed area quadrat samples which sampled two size classes. Line intersect sampling units were established in August 1993 and revisited during August 1994. Line Intersect sampling results suggest …
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Issues in the Interpretation of PISA in Ireland: A Study of the Content and Design of PISA with Comparative Analyses of the Junior Certificate Examinations and TIMSS (1 Volume)
… were carried out to identify aspects of the design and interpretation of the PISA assessments of reading and mathematics which may be problematic and/or at odds with conclusions drawn. Three major questions are addressed. First, what does PISA tell us about achievements of students in …
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The Effects of Environmental Stress on Financial Planning for Retirement
… as exogenous variables. A stratified, random sample design was used to select 364 employees from Norfolk General Hospital. Results were analyzed using path analysis. The results supported the major hypothesis of causal linkages between measures of environmental stress, psychological strain and …
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Fourier-based optical analysis of a membrane mirror spatial light modulator
… We apply these models to case studies of the design and simulation of pixel geometries and readout system designs for a MEMS-based membrane mirror spatial light modulator (MMSLM), for use as a projection display at a range of visible and infrared wavelengths. Output images, contrast curves and …
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Minimum tree height sample sizes necessary for accurately estimating merchantable plot volume in Loblolly pine plantations
… combinations 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 …
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Student Hormonal Responses in Two Learning Environments
… the traditional lecture hall. We used a matched sample design to compare cortisol levels and self-reported stress over the course of seven weeks. We also compared average exam scores and student attendance between the course sections. In this preliminary study, we found that there was no …
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A comparison of the effects of non-normal distributions on tests of equivalence
… tests under varied conditions for a two-sample design; and compared the properties of showing equivalence between populations at the smallest effect sizes. The findings for this report indicated that under conditions where sample sets were non-normally distributed, the differences in the …
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Oral Health Needs of Virginia Schoolchildren by HMO Regions
… used a probability proportional to size (PPS) sample design in selecting school children from public schools in the Commonwealth of Virginia. Surface (DMFS/dfs) and tooth-level (DMFT/dft) data were collected as indicators of dental disease on all children. Child-level data was also recorded for …
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The Relationship Between Obesity and Falls in Older Adults
… Survey were used as research data, and complex sample design analysis was conducted for statistical analysis. According to the BMI classification standard of Korean Society for the Study of Obesity ("KOSSO"), low weight of older adult was 3.7%, normal weight was 35.7%, overweight was 25.5%, and …
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Three dimensional vibrational spectroscopy and shock initiation of hmx
… experimental observation. Much refinement of the sample design was done, but there was still no events observed by SFG that were clearly attributable to HMX initiation. No broadening or new peaks were observed at all, and no significant loss of SFG intensity occurred besides the expected loss from …
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Cognitive apprenticeship in architecture education: using a scaffolding tool to support conceptual design
… the master-apprenticeship relationship, student designers gain access to implicit design knowledge mainly through the conversations with their tutors during studio projects. However, intimate design studio tutelage is being challenged by increasing student to staff ratios. If leveraged …
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Modeling Autocorrelation and Sample Weights in Panel Data: A Monte Carlo Simulation Study
… and autoregressive moving average-ARMA) and sample weights present in a longitudinal panel data set. Specifically, to what extent are the sample estimates influenced when autocorrelation (which is usually present in a panel data having correlated observations and errors) and sample weights …
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A Mobile Robotic Computing Platform For Three-dimensional Indoor Mappi
… speed. This thesis successfully demonstrates the design and implementation of a low cost mobile robotic computing platform with laser scanner, for quickly mapping with high resolution, urban and/or indoor environments using a gyro-enhanced orientation sensor and selectable levels of detail. In …
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Informing U.S. Caribbean fisheries management through simulation modeling: a case of length-based mortality estimation models
… assumptions of constant growth and recruitment, sample sizes (n), and sampling program length (Ys) on total mortality rate estimates (Z). Given the scenarios investigated, the Beverton-Holt model produced consistently biased, but more stable results when n was low, variation was high for both …
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Methods for analysing complex panel data using multilevel models with an application to the Brazilian labour force survey
… in the social sciences are often obtained by sample surveys with complex designs. These designs usually incorporate a multistage selection from a population with a natural hierarchical structure. In addition, these surveys can also be carried out in a repeated manner including a rotating panel …
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Utilization of Stormwater Retention Ponds by Aquatic Turtles in Montgomery County, Virginia
Stormwater ponds design to mitigate the negative impacts of runoff from impervious surfaces in urban areas have become common landscape features as they are required by state and local environmental regulations. While some have hypothesized that stormwater ponds may provide habitat for wildlife, …
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