Description Usage Format Details Source References Examples
Data from NHANES 2005-2006 concerning homocysteine levels in daily smokers (z=1) and never smokers (z=0), aged 20 and older.
1 | data("nh1and3")
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A data frame with 1370 observations consisting of 353 matched pairs and 166 matched sets with 3 controls.
SEQN
NHANES ID number
z
=1 for a daily smoker, =0 for a never smoker
mset
Matched set indicator, for 519 sets, 1, 2, ..., 519
homocysteine
Blood homocysteine level
cigsperday30
Cigarettes smoked per day
cotinine
Cotinine is a biomarker for exposure to nicotine
female
=1 for female, =0 for male
age
Age in years
black
=1 for black, =0 for other
education
NHANES 1-5 score. 3 is a high school degree.
povertyr
Ratio of family income to the poverty level, capped at 5.
Data from NHANES 2005-2006 concerning homocysteine levels in daily smokers (z=1) and never smokers (z=0), aged 20 and older. Daily smokers smoked every day for the last 30 days, smoking an average of at least 10 cigarettes per day. Never smokers smoked fewer than 100 cigarettes in their lives, do not smoke now, and had no tobacco use in the previous 5 days.
NHANES 2005-2006
Bazzano, L. A., He, J., Muntner, P., Vupputuri, S. and Whelton, P. K. (2003) Relationship between cigarette smoking and novel risk factors for cardiovascular disease in the United States. Annals of Internal Medicine, 138, 891-897.
Pimentel, S. D., Small, D. S. and Rosenbaum, P. R. (2016) Constructed second control groups and attenuation of unmeasured biases. Journal of the American Statistical Association, 111, 1157-1167. <doi.org/10.1080/01621459.2015.1076342>
1 2 3 4 5 6 7 8 9 | data(nh1and3)
attach(nh1and3)
table(table(nh1and3$mset))
par(mfrow=c(1,2))
boxplot(homocysteine[1:166]~z[1:166],ylim=c(0,70),main="1-1 match",
ylab="homocysteine",names=c("Control","Smoker"))
boxplot(homocysteine[167:1370]~z[167:1370],ylim=c(0,70),
main="1-3 match",ylab="homocysteine",names=c("Control","Smoke"))
detach(nh1and3)
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