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—Simultaneous discrimination among various para-metric lifetime models is an important step in the parametric analysis of survival data. We consider a plot of the skewness versus the coefficient of variation for the purpose of discriminating among parametric survival models. We extend the method of Cox & Oakes from complete to censored data by developing an… (More)
One of the goals of the No Child Left Behind Act of 2001 (NCLB; 20 U.S.C. § 6301) was to close racial and socioeconomic achievement gaps. Over a decade has passed since NCLB went into effect. In this paper we investigate whether the Act has been successful at narrowing racial achievement gaps. Overall, our analyses provide no support for the hypothesis that… (More)
Nonreciprocal polarisation mode conversion is demonstrated in semiconductor waveguides with an alternating periodic upper cladding incorporating a segmented magneto-optic iron garnet fabricated with a novel lift-off process and crystallised by rapid thermal annealing.