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 122 for “"Sample Selection"”.
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Corrections for Sample Selection Bias
… developed to correct for the effects of sample selection bias are examined for robustness to violations of assumptions in this Monte Carlo study. Corrections derived by Pearson (1903) for cases of explicit and incidental selection are found to be sensitive to variations in (1) the …
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Non-parametric estimation methods for instrumental variables and sample selection : theory and applications
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Economics, 1998.
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A copula approach to sample selection modeling of treatment adherence and viral suppression among HIV patients on antiretroviral therapy (ART) in Namibia
… suppression may result in biased estimates if sample selection is ignored. The study fit a joint distributional model of ART treatment adherence and viral suppression, to adjust for sample selection bias among HIV patients on ART in Namibia, to examine the presence of tail dependence in sample …
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Robust and Fair Machine Learning under Distribution Shift
… Then we build a robust framework to address the sample selection bias for fair classification. Next we solve the sample selection bias issue for fair regression. Finally, we propose an adversarial framework to build a personalized model in the distributed setting where the distribution shift …
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The development and application of online modelling methods
… in numerous stages during which various sample selection methods, including work by Shenk and Westerhaus, were developed and evaluated. The intrinsic nature of the NMR data meant that traditional methods of sample selection could not be employed. The final model used the principal …
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The simulation analysis on the accuracy and efficiency of MIT transaction index
… Geltner and Haurin (2003.) They address the sample selection bias and the noise effect of the transaction prices in small sample. To correct sample selection bias, MIT transaction index use the Heckman two-step. In addition to the correction of sample selection bias the MIT transaction based …
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Sex Differences in Cognitive Performance on Piaget-Like Tasks: A Meta-Analysis of Findings
… domain, response mode, region of country, sample selection, and type of community. Year of publication, type of task and task characteristics in combination with sample selection and sample characteristics explained only 31% of the variance. Problems and concerns related to methodological …
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A Nonparametric Bounds Approach for Hedonic Housing Price Indexes With an Application to the Southern California Market 1996 to 2008
… housing price models partially identified due to sample selection of an unknown form. To construct bounds for the identification region, I use a nonparametric hedonic housing price model that allows spatial correlation and propose estimators of extreme conditional quantiles. The estimated bounds …
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Three Essays Exploring Heterogeneity Using Quantile Regression
… females exhibit significant heterogeneity. Since sample selection is likely to be a problem in estimation of wage differences due to large differences in labor force participation rates between the groups studied, I develop a technique to control for this type of selectivity bias in the quantile …
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Investigating product market Integration in the southern African development community : a price-based approach
… The evaluation identifies several different sample selection effects that bias estimates of distance and border effects in the existing literature, and demonstrates the sensitivity of estimates of transaction costs and border effect s for the SADC region to these sample selection biases using …
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A Critical Examination of Dollar Unit Sampling in the Audit of Accounts Receivable
This research examines three sample selection techniques used in conjunction with dollar unit sampling (DUS) and examines the behavior of five DUS bounds proposed in the accounting literature when applied to simulated accounts receivable populations. This research recognizes that large differences …
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Three approaches to measuring natural resource scarcity : theory and application to groundwater
… assumption, with respect to these attributes, to sample selection is violated. Hence, the simultaneity between hedonic valuation and sample selection is modelled in the context of producer behaviour and investigated empirically in the case of land demanded for use as an input either in …
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Agricultural Technolongy in Bangladesh: a Study on Non-Farm Labor and Adoption by Gender
… who do not participate in non-farm labor. Hence sample selection or self-selection of individuals occurs. A feasible approach to the problem of sample selection is the use of Heckman's Two Stage Selection Correction Model. Income functions were estimated for males and females while correcting for …
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Beverage management: A curriculum needs assessment for undergraduate hospitality education
… a mail survey. The interview utilized a snowball sample of 35 hospitality educators and industry experts. The sample selection for the mail survey included 244 domestic hotel properties and 366 domestic restaurant properties. Study results indicate a need for a beverage management major. …
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Producer Preferences for Alternative Irrigation Practices in the Arkansas Delta
<p>We use a bivariate sample selection model to address peer network effects on participation in and/or intensity of use of land being irrigated by alternative irrigation practices in the state of Arkansas. As groundwater in the state becomes more limited, the use of scientific scheduling, …
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The Effect of Education on Earnings and Employment in the Informal Sector in South Africa
… least squares with multinomial two-step selection corrections to control for both endogeneity of schooling and sector sample selection bias. Quantile regression and piecewise linear spline function methods were applied to deal with the heterogeneity of the returns to schooling. Moreover, …
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Evaluation of Integumental Extension Patterns in American-Japanese and its Comparisons to Burstone's Caucasian Standards
… if measurable differences exist. From a sample of 15 males and 23 female American-Japanese, cephalometric headfilms were taken. Criteria for sample selection was similar to that established by Burstone. Cephalometric measurements of horizontal and vertical extensions were obtained …
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Three Essays on Extremal Quantiles
… index will drift to zero (or one)</p><p>as the sample size increases. The three chapters of my dissertation consists of three</p><p>applications of this concept in three distinct econometric problems. In Chapter 2, I</p><p>use the concept of extremal quantile index to derive new asymptotic …
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Estimation of clinical trial success rates and related parameters
… success rates rely on relatively small samples of pharmaceutical industry-curated databases, which are subject to potential sample selection biases. Using a sample of 185,994 unique entries of clinical-trial data for over 21,143 compounds from January 1st, 2000 to October 31st, 2015, we …
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