Frequencies for first 10,000 rows of previs variable in natlterr2014 dataset :

  Number of |
   Prenatal |
     Visits |
   (Revised |
only) 00-98 |
  Number of |
   prenatal |
     visits |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        151        1.51        1.51
          1 |         92        0.92        2.43
          2 |        124        1.24        3.67
          3 |        165        1.65        5.32
          4 |        223        2.23        7.55
          5 |        322        3.22       10.77
          6 |        410        4.10       14.87
          7 |        399        3.99       18.86
          8 |        593        5.93       24.79
          9 |        623        6.23       31.02
         10 |      1,275       12.75       43.77
         11 |        797        7.97       51.74
         12 |      1,027       10.27       62.01
         13 |        640        6.40       68.41
         14 |        589        5.89       74.30
         15 |        481        4.81       79.11
         16 |        258        2.58       81.69
         17 |        139        1.39       83.08
         18 |        109        1.09       84.17
         19 |         53        0.53       84.70
         20 |        109        1.09       85.79
         21 |         18        0.18       85.97
         22 |         14        0.14       86.11
         23 |          8        0.08       86.19
         24 |          6        0.06       86.25
         25 |         15        0.15       86.40
         26 |          3        0.03       86.43
         27 |          1        0.01       86.44
         29 |          1        0.01       86.45
         30 |         12        0.12       86.57
         35 |          2        0.02       86.59
         36 |          1        0.01       86.60
         37 |          2        0.02       86.62
         38 |          2        0.02       86.64
         39 |          3        0.03       86.67
         40 |          5        0.05       86.72
         41 |          1        0.01       86.73
         43 |          1        0.01       86.74
         55 |          1        0.01       86.75
         56 |          1        0.01       86.76
         99 |        247        2.47       89.23
          . |      1,077       10.77      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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