Frequencies for first 10,000 rows of nprev12 variable in natlterr1999 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         85        0.85        0.85
          2 |        117        1.17        2.02
          3 |        358        3.58        5.60
          4 |        849        8.49       14.09
          5 |      1,507       15.07       29.16
          6 |      2,476       24.76       53.92
          7 |      2,303       23.03       76.95
          8 |        996        9.96       86.91
          9 |        895        8.95       95.86
         10 |        216        2.16       98.02
         11 |        183        1.83       99.85
         12 |         15        0.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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