Frequencies for first 10,000 rows of gestrec10 variable in natlterr2010 dataset :

  Gestation |
  Recode 10 |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |          1        0.01        0.01
          2 |         54        0.54        0.55
          3 |        129        1.29        1.84
          4 |        170        1.70        3.54
          5 |        993        9.93       13.47
          6 |      3,150       31.50       44.97
          7 |      1,985       19.85       64.82
          8 |      1,227       12.27       77.09
          9 |        511        5.11       82.20
         10 |        498        4.98       87.18
         99 |      1,282       12.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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