Frequencies for first 10,000 rows of previs_rec variable in natl2017 dataset :

  Number of |
   Prenatal |
     Visits |
  Recode 01 |
  No visits |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        110        1.10        1.10
          2 |        144        1.44        2.54
          3 |        399        3.99        6.53
          4 |        768        7.68       14.21
          5 |      1,218       12.18       26.39
          6 |      2,052       20.52       46.91
          7 |      2,118       21.18       68.09
          8 |      1,510       15.10       83.19
          9 |        692        6.92       90.11
         10 |        308        3.08       93.19
         11 |        412        4.12       97.31
         12 |        269        2.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018