Frequencies for first 10,000 rows of ilp_r11 variable in natlterr2013 dataset :

   Interval |
 Since Last |
  Pregnancy |
  Recode 11 |
RFP 571=? R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         62        0.62        0.62
          1 |        235        2.35        2.97
          2 |        817        8.17       11.14
          3 |        724        7.24       18.38
          4 |        950        9.50       27.88
          5 |        643        6.43       34.31
          6 |        430        4.30       38.61
          7 |        336        3.36       41.97
          8 |        906        9.06       51.03
         88 |      3,237       32.37       83.40
         99 |        583        5.83       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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