Results 11 to 20 of about 36,817,910 (309)
Hierarchical Crossover in Genetic Algorithms [PDF]
, 1996 This paper identifies the limitations of conventional crossover in genetic algorithms when operating on two chromosomes of differing lengths. To address these problems, the concept of a Semantic Hierarchy (i.e.
Wakefield, Jonathan P. +1 more
core +4 more sources
Selecting appropriate study designs to address specific research questions in occupational epidemiology. [PDF]
, 2007 UNLABELLED: Various epidemiological study designs are available to investigate illness and injury risks related to workplace exposures. The choice of study design to address a particular research question will be guided by the nature of the health ...
Pearce, Neil +2 more
core +1 more source
Antibiotics and oral contraceptive failure — a case-crossover study [PDF]
Contraception, 2011 Evidence on the association between antibiotic use and combined oral contraceptive (COC) failure is controversial. We examined the effect of concomitant antibiotic treatment on the risk of breakthrough pregnancy among COC users.We performed a case-crossover study of 1330 COC failure cases among 17,721 women from the Slone Epidemiology Center Birth ...
Toh, Sengwee +4 more
openaire +3 more sources
Respiratory Research, 2021 Background Positive associations between ambient PM2.5 and cardiorespiratory disease have been well demonstrated during the past decade. However, few studies have examined the adverse effects of PM2.5 based on an entire population of a megalopolis.
Zhan Ren +9 more
doaj +1 more source
Bias in case‐crossover studies of medications due to persistent use: A simulation study [PDF]
Pharmacoepidemiology and Drug Safety, 2020 AbstractPurposeThe case‐crossover design is increasingly used to evaluate the effects of chronic medications; however, as traditionally implemented in pharmacoepidemiology, with referent period preceding the outcome, it may lead to bias in the presence of persistent exposures.
Katsiaryna Bykov +5 more
openaire +2 more sources
Persistent User Bias in Case-Crossover Studies in Pharmacoepidemiology [PDF]
American Journal of Epidemiology, 2016 Studying the effect of chronic medication exposure by means of a case-crossover design may result in an upward-biased odds ratio. In this study, our aim was to assess the occurrence of this bias and to evaluate whether it is remedied by including a control group (the case-time-control design).
Hallas, Jesper +4 more
openaire +2 more sources
EBioMedicine, 2023 Summary: Background: It remains unknown how ambient temperature impact pneumonia of various infectious causes. Methods: Based on the national death registry covering all counties in Chinese mainland, we conducted an individual-level case-crossover study
Qinglin He +7 more
doaj +1 more source
Case-crossover studies of occupational trauma: methodological caveats [PDF]
Injury Prevention, 2001 Objectives—The case-crossover study design was developed to examine triggers for the onset of myocardial infarction. This paper seeks to examine selected methodological issues when applying the case-crossover method to the study of traumatic injuries in the work environment.Methods—Researchers known to be working on occupational case-crossover studies ...
G S, Sorock +4 more
openaire +2 more sources
The Effect of Distinct Geometric Semantic Crossover Operators in Regression Problems [PDF]
, 2015 This paper investigates the impact of geometric semantic crossover operators in a wide range of symbolic regression problems. First, it analyses the impact of using Manhattan and Euclidean distance geometric semantic crossovers in the learning process ...
Albinati, Julio +7 more
core +1 more source
Environmental Health, 2023 Background Satellite-based PM2.5 predictions are being used to advance exposure science and air-pollution epidemiology in developed countries; including emerging evidence about the impacts of PM2.5 on acute health outcomes beyond the cardiovascular and ...
Iván Gutiérrez-Avila +6 more
doaj +1 more source