نتایج جستجو برای: spatial statistic

تعداد نتایج: 380260  

Journal: :Journal of the American Medical Informatics Association : JAMIA 2009
Caroline Jeffery Al Ozonoff Laura Forsberg White Miriam Nuño Marcello Pagano

OBJECTIVE Spatio and/or temporal surveillance systems are designed to monitor the ongoing appearance of disease cases in space and time, and to detect potential disturbances in either dimension. Patient addresses are sometimes reported at some level of geographic aggregation, for example by ZIP code or census tract. While this aggregation has the advantage of protecting patient privacy, it also...

2011
Zhijun Yao Junmei Tang F Benjamin Zhan

BACKGROUND Kulldorff's spatial scan statistic has been one of the most widely used statistical methods for automatic detection of clusters in spatial data. One limitation of this method lies in the fact that it has to rely on scan windows with predefined shapes in the search process, and therefore it cannot detect cluster with arbitrary shapes. We employ a new neighbor-expanding approach and in...

2014
Jie Gao Zhijie Zhang Yi Hu Jianchao Bian Wen Jiang Xiaoming Wang Liqian Sun Qingwu Jiang

County-based spatial distribution characteristics and the related geological factors for iodine in drinking-water were studied in Shandong Province (China). Spatial autocorrelation analysis and spatial scan statistic were applied to analyze the spatial characteristics. Generalized linear models (GLMs) and geographically weighted regression (GWR) studies were conducted to explore the relationshi...

Journal: :International Journal of Health Geographics 2003
Changhong Song Martin Kulldorff

BACKGROUND: Many different test statistics have been proposed to test for spatial clustering. Some of these statistics have been widely used in various applications. In this paper, we use an existing collection of 1,220,000 simulated benchmark data, generated under 51 different clustering models, to compare the statistical power of several disease clustering tests. These tests are Besag-Newell'...

2005
Daniel B. Neill Andrew W. Moore

We describe a general statistical and computational framework for the detection of anomalous spatial clusters, based on the spatial scan statistic [1]. Much of this material has been adapted from [2], to which we refer the reader for a more detailed discussion. We focus here on the purely spatial cluster detection task; for extensions to space-time cluster detection, the reader is referred to [...

Journal: :Canadian Medical Association Journal 2005

2011
Wei Tu Stuart Tedders Jie Tian

Low birth weight (LBW), defined as a live birth weighing less than 2500 g, is a significant public health problem in the United States, but the complex nature of the etiology of this problem is not fully understood. Moreover, significant disparities in LBW prevalence are well documented among certain populations, particularly in minority and underserved communities. The identification of spatia...

2011
Frank J Brooks Perry W Grigsby

BACKGROUND A previous study evaluated the intra-tumoral heterogeneity observed in the uptake of F-18 fluorodeoxyglucose (FDG) in pre-treatment positron emission tomography (PET) scans of cancers of the uterine cervix as an indicator of disease outcome. This was done via a novel statistic which ostensibly measured the spatial variations in intra-tumoral metabolic activity. In this work, we argue...

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