Frequencies for first 10,000 rows of nprev12 variable in natlterr2001 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         94        0.94        0.94
          2 |         81        0.81        1.75
          3 |        262        2.62        4.37
          4 |        750        7.50       11.87
          5 |      1,342       13.42       25.29
          6 |      2,711       27.11       52.40
          7 |      2,262       22.62       75.02
          8 |      1,166       11.66       86.68
          9 |        853        8.53       95.21
         10 |        254        2.54       97.75
         11 |        211        2.11       99.86
         12 |         14        0.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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