Frequencies for first 10,000 rows of bwimp variable in natl1999 dataset :

    Imputed |
Birthweight |      Freq.     Percent        Cum.
------------+-----------------------------------
        255 |          1        0.01        0.01
        765 |          1        0.01        0.02
       3090 |          1        0.01        0.03
       9999 |          2        0.02        0.05
          . |      9,995       99.95      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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