Frequencies for first 10,000 rows of previs_rec variable in natl2011 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode RFP |
 671=f_tpcv |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         55        0.55        0.55
          2 |        207        2.07        2.62
          3 |        445        4.45        7.07
          4 |        869        8.69       15.76
          5 |      1,440       14.40       30.16
          6 |      2,184       21.84       52.00
          7 |      1,882       18.82       70.82
          8 |      1,210       12.10       82.92
          9 |        559        5.59       88.51
         10 |        182        1.82       90.33
         11 |        213        2.13       92.46
         12 |        754        7.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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