Frequencies for first 10,000 rows of nprev12 variable in natlterr1995 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        164        1.64        1.64
          2 |        101        1.01        2.65
          3 |        419        4.19        6.84
          4 |        977        9.77       16.61
          5 |      1,592       15.92       32.53
          6 |      2,605       26.05       58.58
          7 |      2,021       20.21       78.79
          8 |      1,021       10.21       89.00
          9 |        720        7.20       96.20
         10 |        200        2.00       98.20
         11 |        166        1.66       99.86
         12 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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