A data frame with 10000 observations on the following 7 variables.
asecwt
weight
year
a factor indicating period groups with levels 1 2 3 4 5 6
age
a factor indicating age groups with levels 1 2 3 4 5 6 7 8 9
labforce
labor Force participation rate
educ
education level
educr
education level
educc
education level