Frequencies for first 10,000 rows of bwimp variable in natl2001 dataset :

    Imputed |
Birthweight |      Freq.     Percent        Cum.
------------+-----------------------------------
        250 |          1        0.01        0.01
        347 |          1        0.01        0.02
        510 |          1        0.01        0.03
       2810 |          1        0.01        0.04
       3657 |          1        0.01        0.05
          . |      9,995       99.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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