Frequencies for first 10,000 rows of nprev12 variable in natl2000 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        129        1.29        1.29
          2 |         90        0.90        2.19
          3 |        160        1.60        3.79
          4 |        418        4.18        7.97
          5 |        734        7.34       15.31
          6 |      1,833       18.33       33.64
          7 |      2,621       26.21       59.85
          8 |      1,811       18.11       77.96
          9 |      1,455       14.55       92.51
         10 |        346        3.46       95.97
         11 |        314        3.14       99.11
         12 |         89        0.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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