Frequencies for first 10,000 rows of previs_rec variable in natlterr2003 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         71        0.71        0.71
          2 |         55        0.55        1.26
          3 |        193        1.93        3.19
          4 |        533        5.33        8.52
          5 |      1,102       11.02       19.54
          6 |      2,704       27.04       46.58
          7 |      2,512       25.12       71.70
          8 |      1,386       13.86       85.56
          9 |        967        9.67       95.23
         10 |        250        2.50       97.73
         11 |        223        2.23       99.96
         12 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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