The NHANES
package contains two version of a data set from the US National Health and Nutrition Examination Study.
NHANESraw
contains data from the NHANES website, recoded to make it easier to work with in R.NHANES
contains a resampled version of this that takes into account the sampling scheme employed. The resulting data set is a reasonable approxiamtion to a simple random sample fron the US population.See the help pages for the data sets for more details.