Frequencies for first 10,000 rows of ilp_r11 variable in natl2015 dataset :

   Interval |
 Since Last |
  Pregnancy |
  Recode 11 |
 00 Zero to |
   3 months |
 (plural de |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        111        1.11        1.11
          1 |        304        3.04        4.15
          2 |        831        8.31       12.46
          3 |        878        8.78       21.24
          4 |      1,292       12.92       34.16
          5 |        772        7.72       41.88
          6 |        429        4.29       46.17
          7 |        287        2.87       49.04
          8 |        600        6.00       55.04
         88 |      2,890       28.90       83.94
         99 |      1,606       16.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016