Frequencies for first 10,000 rows of gestrec3 variable in linkpe2009psden dataset :

  Gestation |
   Recode 3 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,640       16.40       16.40
          2 |      8,353       83.53       99.93
          3 |          7        0.07      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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