Frequencies for first 10,000 rows of gestrec10 variable in natl2003 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          2 |         40        0.40        0.40
          3 |         88        0.88        1.28
          4 |        483        4.83        6.11
          5 |        464        4.64       10.75
          6 |      5,117       51.17       61.92
          7 |      2,178       21.78       83.70
          8 |      1,025       10.25       93.95
          9 |        521        5.21       99.16
         10 |         84        0.84      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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