نتایج جستجو برای: threshold regression
تعداد نتایج: 433844 فیلتر نتایج به سال:
BACKGROUND To estimate a threshold limit value for a compound known to have harmful health effects, an 'elbow' threshold model is usually applied. We are interested on non-parametric flexible alternatives. METHODS We describe how a step function model fitted by isotonic regression can be used to estimate threshold limit values. This method returns a set of candidate locations, and we discuss ...
Introduction & Objective: Retinopathy of prematurity (ROP) is a major cause of blindness in premature newborns. It accounts for 4% of childhood blindness in developed countries and up to 40% in developing countries. The aim of this study is to report the refractive and anatomical outcome of patients who had undergone laser photocoagulate on for retinopathy of prematurity (ROP). Materials & M...
Introduction: The purpose of this study was to develop a statistical model for prediction of radiation induced sensorineural hearing loss (SNHL) induced by radiotherapy in patients with brain tumors. Materials and Methods: CT scan of 18 patients (10 males and 8 females) with brain tumor who were referred to Radiation Center of Milad Hospital in Isfahan in 2...
PURPOSE The Argus II epiretinal prosthesis has been developed to provide partial restoration of vision to subjects blinded from outer retinal degenerative disease. Participants were surgically implanted with the system in the United States and Europe in a single arm, prospective, multicenter clinical trial. The purpose of this investigation was to determine which factors affect electrical thres...
As a typical technology-intensive industry, the renewable energy industry is standard sample for scholars to study R&D innovation of enterprises. At present, strongly supported by government subsidy policy in China and has developed rapidly recent years. Its own financing constraints lack power are also main problems development Taking A-share enterprises from 2016 2020 as research object, ...
Government spending on public infrastructure, education and healthcare can provide a positive boost to economic growth, however each financing sources can affect economic growth differently. Which source of finance is less distortionary and boosts growth? In order to answer this question, this paper analyzes the impact of financing sources (oil and tax revenues) on the Iranian economic growth. ...
This paper investigates the non-linear effects produced by main determinants of sovereign ratings issued Moody’s agency. Using a sample 29 countries observed over 2000–2019 period, we identify factors leading country to be classified, respectively, in speculative, moderately and highly speculative grades. The fixed effect logit estimates reveal that independent variables on are largely differen...
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