Frequencies for first 10,000 rows of ilop_r11 variable in natl2013 dataset :

   Interval |
 Since Last |
      Other |
  Pregnancy |
    Outcome |
  Recode 11 |
RFP 571=? R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |          4        0.04        0.04
          1 |        237        2.37        2.41
          2 |        383        3.83        6.24
          3 |        207        2.07        8.31
          4 |        293        2.93       11.24
          5 |        234        2.34       13.58
          6 |        160        1.60       15.18
          7 |        149        1.49       16.67
          8 |        480        4.80       21.47
         88 |      6,327       63.27       84.74
         99 |      1,526       15.26      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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