منابع مشابه
Ecologic versus individual-level sources of bias in ecologic estimates of contextual health effects.
A number of authors have attempted to defend ecologic (aggregate) studies by claiming that the goal of those studies is estimation of ecologic (contextual or group-level) effects rather than individual-level effects. Critics of these attempts point out that ecologic effect estimates are inevitably used as estimates of individual effects, despite disclaimers. A more subtle problem is that ecolog...
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Cancer is the second leading cause of death worldwide. According to the World Health Organisation (WHO), 12,5% of all deaths every year are caused by cancer (WHO, 2006). This is more than the total percentage of people who die from AIDS, tuberculosis and malaria, put together (International Union Against Cancer [UICC], 2007). Frightening fact is that deaths from cancer are projected to steadily...
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Even though companies maintain highly-structured, traditional business data in relational databases, large amounts of information are available in semi-structured text sources, such as indexed online newspapers , patent information, literature citations or business prooles. This information is ooered by commercial providers who maintain complete control over access language, schemas and update ...
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ژورنال
عنوان ژورنال: American Journal of Public Health and the Nations Health
سال: 1969
ISSN: 0002-9572
DOI: 10.2105/ajph.59.1.4