Frequencies for first 10,000 rows of previs_rec variable in natlterr2011 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        251        2.51        2.51
          2 |        140        1.40        3.91
          3 |        280        2.80        6.71
          4 |        579        5.79       12.50
          5 |        884        8.84       21.34
          6 |      1,672       16.72       38.06
          7 |      1,531       15.31       53.37
          8 |        977        9.77       63.14
          9 |        599        5.99       69.13
         10 |        174        1.74       70.87
         11 |        189        1.89       72.76
         12 |      2,724       27.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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