Frequencies for first 10,000 rows of previs_rec variable in natl2009 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode RFP |
 671=f_tpcv |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        219        2.19        2.19
          2 |        114        1.14        3.33
          3 |        218        2.18        5.51
          4 |        600        6.00       11.51
          5 |      1,036       10.36       21.87
          6 |      2,334       23.34       45.21
          7 |      2,523       25.23       70.44
          8 |      1,518       15.18       85.62
          9 |      1,005       10.05       95.67
         10 |        146        1.46       97.13
         11 |        221        2.21       99.34
         12 |         66        0.66      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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