exposure

15:22 Nov 1, 2012
This question was closed without grading. Reason: No acceptable answer

English language (monolingual) [PRO]
Social Sciences - International Org/Dev/Coop
English term or phrase: exposure
Countries without eligible death registration data
For these countries without death registration data at least 80% complete and with populations greater than 150 000, a regression model was used to estimate total road traffic deaths. As for the first report, we used a negative binomial regression model, appropriate for modeling non-negative integer count data (number of road traffic deaths) (Law 2009, Hilbe 2007). A likelihood ratio test was used to assess that the negative binomial model provided a better fit to the data than a Poisson model (where the variance of the data is constrained to equal the mean).
(equation)

where N is the total road traffic deaths (for a country-year), C is a constant term, Xi are a set of explanatory covariates, Pop is the population for the country-year, and  is the negative binomial error term. Population was used as **exposure**, making it possible to interpret the coefficients (βi) for the independent variables as effects on rates rather than a count. In a previous study, this type of model was used to represent "accident proneness" (Greenwood and Yule, 1920). Karlaftis and Tarko (1998) have also found a negative binomial regression model to be the appropriate for count data such as road traffic fatalities.

Thank you for your help!
Nadia Ayoub
Egypt
Local time: 15:17


SUMMARY OF ALL EXPLANATIONS PROVIDED
2risk exposed
dandamesh


  

Answers


12 mins   confidence: Answerer confidence 2/5Answerer confidence 2/5
risk exposed


Explanation:
Exposed
In epidemiology, the exposed group is often used to connote a group whose members have been exposed to a supposed cause of a disease or health state of interest, or possess a characteristic that is a determinant of the health outcome of interest.
http://cf.unc.edu/epid600/resources/gloss.htm



dandamesh
Native speaker of: Native in ItalianItalian
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