Data from NHANES 2009-2010. 397 treated people who ate at least 15 servings of fish or shellfish during the previous month are matched to two controls who ate at most one serving of fish or shellfish. The values in methylmercury record the level of methylmercury in blood in mu-g/dl.
Usage
data("mercury")
Arguments
Format
A data frame with 1191 observations on the following 6 variables.
SEQN
NHANES 2009-2010 id number
methylmercury
Methylmercury in blood in mu-g/dl
fish
1 if ate >= 15 servings of fish or shellfish, 0 if <=1 serving
mset
Matched set indicator, 1,...,397.
female
1 if female, 0 if male
black
1 if black, 0 otherwise
Details
Sets were matched 2-to-1 for for age, sex, ratio of household income to
the poverty level, education, ethnic group (black, Hispanic, or
other), and cigarette smoking. A table showing covariate balance
after matching is in Rosenbaum (2014, Table 1).
References
Rosenbaum, P. R. (2014) Weighted M-statistics with superior design sensitivity
in matched observational studies with multiple controls. Journal of the
American Statistical Association, 2014. <doi:10.1080/01621459.2013.879261>