Frequencies for first 10,000 rows of gestrec10 variable in natl2010 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         38        0.38        0.38
          3 |         86        0.86        1.24
          4 |         98        0.98        2.22
          5 |        723        7.23        9.45
          6 |      2,492       24.92       34.37
          7 |      2,603       26.03       60.40
          8 |      2,143       21.43       81.83
          9 |      1,109       11.09       92.92
         10 |        687        6.87       99.79
         99 |         21        0.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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