Frequencies for first 10,000 rows of birwt4 variable in natl2001 dataset :

      Birth |
     Weight |
   Recode 4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        182        1.82        1.82
          2 |        746        7.46        9.28
          3 |      9,066       90.66       99.94
          4 |          6        0.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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