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Showing 1 to 9 of 9 for “"Portnoy"”.
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A Partly Linear Model for Censored Regression Quantiles
… regression on censored data was developed by Portnoy (2003). The recursively reweighted Censored Regression Quantile (CRQ) estimator of Portnoy (2003), which is essentially a generalization of the Kaplan-Meier estimator, is a useful complement to the Cox proportional hazards model for survival …
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Variable screening and model selection in censored quantile regression via sparse penalties and stepwise refinement
… we use the random censored quantile regression Portnoy estimators (2010). This method simplifies the censored problem into a weight problem. When combined with the penalized regression method: LASSO and SCAD, one can perform variable screening for the censored data at quantiles of interest. …
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Quantile autoregression with censored data
… have been prominent works by Powell (1986), Portnoy (2003) and Peng and Huang (2008) on estimating the conditional quantile functions with censored data. However, unlike the standard regression models, the autoregressive models should take account of censoring on both response and regressors. …
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Nonparametric testing for random effects in mixed effects models based on the piecewise linear interpolate of the log characteristic function
… approach were presented first by Meintanis and Portnoy (2011). The best initial grid and grid length were found, and empirical powers from the presented approach were compared with the empirical powers from Kolmogorov-Smirnov test under two venues, the first one assuming the variance of the …
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Exploring Educational Psychologists’ views and experiences of the Beads of Life narrative therapy based intervention
… view their problems as separate to themselves (Portnoy et al., 2016). Despite a core function of the Educational Psychologist (EP) role being to deliver effective interventions that promote positive emotional wellbeing and mental health, little is known about EPs’ experiences of facilitating …
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Quantitative embeddings with applications
In this thesis, we discuss quantitative embeddings that generalize a theorem of Kolmogorov and Barzdin. The theorem says that any bounded degree graph with V vertices can be mapped into a 3-dimensional ball of radius sqrt(V), so that at most a constant number of edges intersect any unit ball. In …
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The Conductance of a Cleaned Germanium Surface
Made available in DSpace on 2015-05-12T17:12:15Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 5904552.PDF: 2450668 bytes, checksum: 9e9446691269b241c54815305abf4c2b (MD5) Previous issue date: 1959
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Three essays on the economics of education
… quantile regression approach proposed by Portnoy (2003). We find that students with higher entrance exam scores are more likely to dropout of college in the beginning of their college journey while being less likely to dropout after some time. Such results are likely due to the perception …