Frequencies for first 10,000 rows of birwt12 variable in natl1985 dataset :

Birthweight |
  Recode 12 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          7        0.07        0.07
          2 |         52        0.52        0.59
          3 |         61        0.61        1.20
          4 |        157        1.57        2.77
          5 |        513        5.13        7.90
          6 |      1,727       17.27       25.17
          7 |      3,607       36.07       61.24
          8 |      2,801       28.01       89.25
          9 |        887        8.87       98.12
         10 |        161        1.61       99.73
         11 |         19        0.19       99.92
         12 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 Jan 2016