Frequencies for first 10,000 rows of previs_rec variable in natl2012 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode RFP |
 671=f_tpcv |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         28        0.28        0.28
          2 |        182        1.82        2.10
          3 |        404        4.04        6.14
          4 |        847        8.47       14.61
          5 |      1,274       12.74       27.35
          6 |      2,168       21.68       49.03
          7 |      2,148       21.48       70.51
          8 |      1,240       12.40       82.91
          9 |        632        6.32       89.23
         10 |        257        2.57       91.80
         11 |        237        2.37       94.17
         12 |        583        5.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 5 May 2016