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 54 for “"sampling error"”.
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Sampling error of the supremum of a Lévy process
This thesis is to study the expected difference of the continuous supremum and discrete maximum of a Lévy process that is often used in finance. We will show that the expected difference is a quantity that highly depends on the variational property of the underlying Lévy process. Two techniques are …
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Sampling error and environmental noises in passive microwave rainfall retrieval from space
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Error behavior and optimal discretization of chaotic differential equations
… equations, then, chaos introduces statistical errors alongside discretization errors. These statistical errors are generally one of two types: transient spin-up error before the system reaches the attractor (i.e. the stationary distribution of long-run states) and sampling error due to …
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Simultaneous process control of several independent quality variables
… the dual objectives of providing a true level of sampling error probabilities for the joint control of several quality variables while also giving problem diagnoses for the quality variables individually. The method is comprised of an afine transformation of the multiple quality variables which …
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Evaluating the Value of Information Concerning Different Methods of Forest Sampling
… However, the compromise made between the cost of sampling methods during inventory, and the accuracy of the information gathered has not been fully recognized. This study evaluates the value of information across multiple sampling methods and intensities. The objectives focus on 1) evaluating …
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Robust portfolio construction: using resampled efficiency in combination with covariance shrinkage
… The first technique focusses on estimation error in the sample covariance (one of portfolio optimisation inputs). In particular shrinkage techniques applied to the sample covariance matrix are considered and the merits thereof are assessed. The second technique considered in the thesis …
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Estimates of school productivity and implications for policy
… was not perfectly estimated because of the sampling error and the measurement error. The traditional Ordinary Least Square (OLS) leaves the estimation of school productivity questionable. Moreover, Hierarchical Linear Model (HLM) encounters a large proportion of the variance unexplained in …
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Multivariate Correlations: Balance Operators and Variable Localization in Ensemble Data Assimilation
… eliminate correlations that are contaminated by sampling error. This method is frequently necessary within numerical weather prediction (NWP) applications due to the computational constraints present, limiting the number of ensemble members to a size much smaller than the dimension of the system. …
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Theoretical and Statistical Approaches to Understand Human Mitochondrial DNA Heteroplasmy Inheritance
… experimental data. The absence of an estimate of sampling error of mtDNA heteroplasmy variance may largely affect the biological interpretation drawn from this high-order statistic, thereby we have developed three different methods to estimate sampling error values for mtDNA heteroplasmy variance. …
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Mixed signal compensation of sampling errors in ADCs due to noisy DPLL clock sources
This thesis clarifies a method to compensate for sampling errors in ADCs when a noisy digital phase locked-loop (DPLL). A time domain DPLL is built by MATLAB Simulink with a phase noise model. The phase noise is obtained from a measured oscillator. When DPLL achieve lock, the time-to-digital …
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Hybrid explicit-implicit FDTD-FEM time-domain solver for electromagnetic problems
… condition. A procedure, which reduces time-sampling error yet preserves the stability of algorithm is proposed. Both explicit and implicit time-stepping schemes were treated in the framework of the developed method. An improved version of the implicit-explicit FEM-FDTD hybrid method was …
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A comparison of alternative methods to the shewhart-type control chart
… for comparison is the probability of a Type II sampling error. Several out-of-control cases are examined. In the case of Repko, an equation is defined to compute the Type II error probability. The results indicate that the Reynolds and Ghosh statistic is powerful for cases when the variance …
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Reliability generalization: lapsus linguae
… variation in reliability coefficients is due to sampling error; results illustrate that the reliability of a test will vary across test administrations based on the size and composition of the sample and how the sample was selected (randomly versus non-randomly).</p>
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A stepwise test characteristic curve method to detect item parameter drift
… not remain invariant due to factors other than sampling error, and this is termed item parameter drift (IPD). Several methods have been proposed to detect drifted items. However, most of the existing methods aim at detecting the drift in individual items, which may not be ideal when only the …
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Effects of career guidance on grade 9 learners' readiness to make career choices
… were statistically significant and not due to sampling error. The post-test scores were significantly higher than the pre-test scores, it was found that there was no significant difference between the pre-test scores and the control group's scores. It was concluded that career guidance does …
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The Effect of Simulator Platform Motion on Pilot Training Transfer: A Meta-Analysis
… mean effect size because the resulting sampling error variance was larger than the observed variance in d across the assessed studies. This led to a negative variance estimate for δ and subsequently an estimated SD<sub>δ</sub> of 0. These results suggest that simulator motion has a …
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PTSD Symptom Severity and Neurocognitive Performance as a Function of Combined TMS and Imaginal Exposure in OIF/OEF Combat Veterans with Treatment Resistant PTSD
… with caution due to the likelihood of sampling error associated with a small sample size. However, clinical results were striking, with six of the seven participants no longer meeting criteria for PTSD by the end of the study. Clinical results for this pilot study were promising and …
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The application of a single control chart for dependent variables in multivariate quality control
… monitored. This method can result in errors due to not accounting for the effects of correlation. In order to avoid these errors, an alternate approach to multivariate quality control problems is proposed and studied here. The original problem is converted into a univariate problem by …
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A modified approach for obtaining sieve bootstrap prediction intervals for time series
… of the methods to capture variations due to sampling error of some parameter estimates. In this dissertation, a modified sieve bootstrap approach, that corrects these deficiencies, is implemented to obtain prediction intervals for both univariate and multivariate time series. Monte Carlo …
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Item parameter drift and online calibration
… test administrations due to factors other than sampling error; and this phenomenon is termed item parameter drift. Several methods have been developed to detect drifted items, and most of the them were designed to detect drifts in the unidimensional item response model under the paper and pencil …
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