Frequencies for first 10,000 rows of bwimp variable in natl2000 dataset :

    Imputed |
Birthweight |      Freq.     Percent        Cum.
------------+-----------------------------------
        580 |          1        0.01        0.01
        810 |          1        0.01        0.02
       3345 |          1        0.01        0.03
          . |      9,997       99.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015