This dataset pertains to children and their families in the United States and is intended to illustrate missing data issues. Note that although the original data are longitudinal, this extract is not.
A data frame with 400 randomly subsampled observations on the following 7 variables.
a numeric vector with data on the Peabody Picture Vocabulary Test (Revised) administered at 36 months
indicator for whether child was first-born
indicator for whether mother was married when child was born
a numeric vector with data on family income in year after the child was born
a numeric vector with data on the age of the mother when the child was born
educational status of mother when child was born (1 = less than high school, 2 = high school graduate, 3 = some college, 4 = college graduate)
race of mother (1 = black, 2 = Hispanic, 3 = white)
Note that momed would typically be an ordered
factor while momrace
would typically be an unorderd
factor but both are
numeric in this
data.frame in order to illustrate the mechanism to
type of a
National Longitudinal Survey of Youth, 1997, http://www.bls.gov/nls/nlsy97.htm
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