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.
Usage
data(nlsyV)
Format
A data frame with 400 randomly subsampled observations on the following 7 variables.
ppvtr.36
a numeric vector with data on the Peabody Picture Vocabulary Test (Revised)
administered at 36 months
first
indicator for whether child was first-born
b.marr
indicator for whether mother was married when child was born
income
a numeric vector with data on family income in year after the child was born
momage
a numeric vector with data on the age of the mother when the child was born
momed
educational status of mother when child was born (1 = less than high school,
2 = high school graduate, 3 = some college, 4 = college graduate)
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 change the
type of a missing_variable