Frequencies for first 10,000 rows of nprev12 variable in natl1996 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        127        1.27        1.27
          2 |        109        1.09        2.36
          3 |        185        1.85        4.21
          4 |        499        4.99        9.20
          5 |        805        8.05       17.25
          6 |      2,291       22.91       40.16
          7 |      2,306       23.06       63.22
          8 |      1,486       14.86       78.08
          9 |      1,490       14.90       92.98
         10 |        241        2.41       95.39
         11 |        355        3.55       98.94
         12 |        106        1.06      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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