ECOLOGIC STUDIES OF ARBOVIRUS IN GUNMA PREFECTURF, JAPAN
نویسندگان
چکیده
منابع مشابه
Ecologic studies revisited.
Ecologic studies use data aggregated over groups rather than data on individuals. Such studies are popular because they use existing databases and can offer large exposure variation if the data arise from broad geographical areas. Unfortunately, the aggregation of data that define ecologic studies results in an information loss that can lead to ecologic bias. Specifically, ecologic bias arises ...
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Yukio Morita*, Hayato Kogure, Mitsuru Sandoh, Gihei Kawashima, Yoshitake Sato, Sadao Nanba, Yoshihiro Shoda, Tomoyuki Suzuki, Masataka Shiono, Masae Shiobara, Masahiko Kato, Kunihisa Kozawa, Masahiro Noda, Nobuhiko Okabe and Hirokazu Kimura Gunma Prefectural Institute of Public Health and Environmental Sciences; Department of Internal Medicine, General Ota Hospital, Society of Health Insurance ...
متن کاملMapping Land Cover Patterns of Gunma Prefecture, Japan, by Using Remote Sensing
A set of land-cover pattern maps for the Gunma Prefecture was produced to help understand and assess the ecological implications of regional spatial patterns. Covering a total area of approximately 6,360 square kilometers, about 77 percent of this area can be regarded as “vegetation cover”. The land cover map was derived from the supervised classification process with the combined use of TM, SP...
متن کاملBias magnification in ecologic studies: a methodological investigation
BACKGROUND As ecologic studies are often inexpensive to conduct, consideration of the magnitude and direction of ecologic biases may be useful in both study design and sensitivity analysis of results. This paper examines three types of ecologic bias: confounding by group, effect measure modification by group, and non-differential exposure misclassification. METHODS Bias of the risk difference...
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ژورنال
عنوان ژورنال: The KITAKANTO Medical Journal
سال: 1968
ISSN: 0023-1908,1883-6135
DOI: 10.2974/kmj1951.18.487