Frequencies for first 10,000 rows of previs_rec variable in natl2013 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode RFP |
 671=f_tpcv |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        106        1.06        1.06
          2 |        183        1.83        2.89
          3 |        402        4.02        6.91
          4 |        802        8.02       14.93
          5 |      1,346       13.46       28.39
          6 |      2,146       21.46       49.85
          7 |      1,977       19.77       69.62
          8 |      1,258       12.58       82.20
          9 |        649        6.49       88.69
         10 |        244        2.44       91.13
         11 |        366        3.66       94.79
         12 |        521        5.21      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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