Frequencies for first 10,000 rows of previs_rec variable in natlterr2009 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        141        1.41        1.41
          2 |        207        2.07        3.48
          3 |        288        2.88        6.36
          4 |        483        4.83       11.19
          5 |        947        9.47       20.66
          6 |      2,026       20.26       40.92
          7 |      2,068       20.68       61.60
          8 |      1,321       13.21       74.81
          9 |        688        6.88       81.69
         10 |        258        2.58       84.27
         11 |        199        1.99       86.26
         12 |      1,374       13.74      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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