Frequencies for first 10,000 rows of nprev12 variable in natlterr1998 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        105        1.05        1.05
          2 |         87        0.87        1.92
          3 |        339        3.39        5.31
          4 |        828        8.28       13.59
          5 |      1,486       14.86       28.45
          6 |      2,660       26.60       55.05
          7 |      2,333       23.33       78.38
          8 |        986        9.86       88.24
          9 |        785        7.85       96.09
         10 |        218        2.18       98.27
         11 |        163        1.63       99.90
         12 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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