Frequencies for first 10,000 rows of previs_rec variable in natlterr2005 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        275        2.75        2.75
          2 |        232        2.32        5.07
          3 |        470        4.70        9.77
          4 |        790        7.90       17.67
          5 |      1,152       11.52       29.19
          6 |      1,983       19.83       49.02
          7 |      1,553       15.53       64.55
          8 |        773        7.73       72.28
          9 |        586        5.86       78.14
         10 |        161        1.61       79.75
         11 |        236        2.36       82.11
         12 |      1,789       17.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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