Agent Orange
In 1987, researchers measured the TCDD concentration in blood samples from 646 U.S. veterans of the Vietnam War and from 97 U.S. veterans who did not serve in Vietnam. TCDD is a carcinogenic dioxin in the herbicide called Agent Orange, which was used to clear jungle hiding areas by the U.S. military in the Vietnam War between 1962 and 1970.
data(case0302)
A data frame with 743 observations on the following 2 variables.
Dioxinthe concentration of TCDD, in parts per trillion
Veteranfactor variable with two levels,
"Vietnam" and "Other", to indicate the type of veteran
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
Centers for Disease Control Veterans Health Studies: Serum 2,3,7,8-Tetraclorodibenzo-p-dioxin Levels in U.S. Army Vietnam-era Veterans. Journal of the American Medical Association 260: 1249–1254.
str(case0302) boxplot(Dioxin ~ Veteran, case0302) t.test(Dioxin ~ Veteran, case0302) ## To examine results with largest dioxin omitted t.test(Dioxin ~ Veteran, case0302, subset=(Dioxin < 40))
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