The purpose of our study is to investigate the fact that gastrointestinal system bleeding, which is a major cause of mortality, is not diagnosed faster by any additional laboratory tests except physical examination and endoscopy, but it is negative in terms of time, workload and cost. Our study was retrospective and the hospital information system was scanned and the patients who were referred ...

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Propensity score matching is a tool for causal inference in non-randomized studies that allows for conditioning on large sets of covariates. The use of propensity scores in the social sciences is currently experiencing a tremendous increase; however it is far from a commonly used tool. One impediment towards a more wide-spread use of propensity score methods is the reliance on specialized softw...

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GIS managers traditionally consider three perspectives of the nature of GIS when introducing GIS into an organization. When the GIS is developed to address focused and well de® ned problems of the organization, these perspectives adequately describe the changing identities of GIS in the study of its di€ usion. However when the GIS is developed to address strategic, but vaguely de® ned problems,...