Frequencies for first 10,000 rows of previs_rec variable in natl2014 dataset :

  Number of |
   Prenatal |
     Visits |
  Recode 01 |
  No visits |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         81        0.81        0.81
          2 |        143        1.43        2.24
          3 |        437        4.37        6.61
          4 |        842        8.42       15.03
          5 |      1,299       12.99       28.02
          6 |      2,068       20.68       48.70
          7 |      1,959       19.59       68.29
          8 |      1,256       12.56       80.85
          9 |        625        6.25       87.10
         10 |        232        2.32       89.42
         11 |        276        2.76       92.18
         12 |        782        7.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Jun 2016