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