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Hwang, Won-Young; Ahn, D.; Hwang, Sangwon; Han, Yeong Deok

doi:10.1007/s10053-002-8863-7

Cited by 11 publications

(17 citation statements)

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“…Hence, it is desirable to modify the Etzioni method with reliable and robust methods for extrapolating the survival function. Hwang and Wang (1999) proposed borrowing external information from an age-and sex-matched reference population to aid the survival extrapolation of an index cohort. The curve of logit transformation of the relative survival between the index cohort and the reference population would follow an approximately straight line if the excess hazard of the patients remains constant over time (Fang, Chang, Hsu, et al, 2007).…”

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confidence: 99%

“…The assumption of an excess constant hazard, however, is usually untestable with a limited observed time period, because how closely the curve of logit-transformed relative survival approaches a straight line is uncertain. In this study, we propose a new approach without the assumption of an excess constant hazard to improve Hwang and Wang's (1999) survival extrapolation method by using restricted cubic splines models to predict the curve beyond the maximum follow-up time, step-by-step.…”

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confidence: 99%

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Estimating lifetime medical costs from censored claims data

Hwang

Lee

et al. 2017

Health Economics

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Claims databases consisting of routinely collected longitudinal records of medical expenditures are increasingly utilized for estimating expected medical costs of patients with a specific condition. Survival data of the patients of interest are usually highly censored, and observed expenditures are incomplete. In this study, we propose a survival-adjusted estimator for estimating mean lifetime costs, which integrates the product of the survival function and the mean cost function over the lifetime horizon. The survival function is estimated by a new algorithm of rolling extrapolation, aided by external information of age- and sex-matched referents simulated from national vital statistics. The mean cost function is estimated by a weighted average of mean expenditures of patients in a number of months prior to their death, of which the number could be determined by observed costs in their final months, and the weights depend on extrapolated hazards. We evaluate the performance of the proposed approach in comparison with that of a popular method using simulated data under various scenarios and 2 cohorts of intracerebral hemorrhage and ischemic stroke patients with a maximum follow-up of 13 years and conclude that our new method estimates the mean lifetime costs more accurately.

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confidence: 99%

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confidence: 99%

Estimating lifetime medical costs from censored claims data

Hwang

Lee

et al. 2017

Health Economics

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“…It may be observed that there is one prominent peak at 292 cm À1 for all the three samples. The strong peak at 292 cm À1 may be assigned to the A 1 mode [22] of chalcopyrite CuInS 2 . The Raman spectra also revealed that the intensity of the peak at 292 cm À1 increases with increasing annealing temperature.…”

Section: Resultsmentioning

confidence: 97%

Fabrication of nanostructured CuInS2 thin films by ion layer gas reaction method

Das

Panda

Chaudhuri

2007

Applied Surface Science

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“…While σ i are the covariant widths and are related to the size of the hadron and they can be evaluated from the charge radius of the hadrons according to quark model [11,12]. For D meson the widths are fixed by the mean square charge radius of D + which is given by r 2 ch = 0.184 f m 2 and it correspond to σ = 0.283 GeV while for Λ + c we have r 2 ch = 0.15 f m 2 and the corresponding widths are σ 1 = 0.18 GeV and σ 2 = 0.342 GeV.…”

Section: Coalescencementioning

confidence: 99%

Strange and heavy hadrons production from coalescence plus fragmentation in AA collisions at RHIC and LHC

et al. 2018

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Abstract. In a coalescence plus fragmentation approach we study the p T spectra of charmed hadrons D 0 , D s up to about 10 GeV and the Λ + c /D 0 ratio from RHIC to LHC energies. In this study we have included the contribution from decays of heavy hadron resonances and also that due to fragmentation of heavy quarks that are left in the system after coalescence. The p T dependence of the heavy baryon/meson ratios is found to be sensitive to the heavy quark mass. In particular we found that the Λ c /D 0 is much flatter than the one for light baryon/meson ratio like p/π and Λ/K.

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Cited by 11 publications

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Estimating lifetime medical costs from censored claims data

Estimating lifetime medical costs from censored claims data

Fabrication of nanostructured CuInS2 thin films by ion layer gas reaction method

Strange and heavy hadrons production from coalescence plus fragmentation in AA collisions at RHIC and LHC

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