Frequencies for first 10,000 rows of previs variable in natl2015 dataset :

  Number of |
   Prenatal |
     Visits |
   (Revised |
only) 00-98 |
  Number of |
   prenatal |
     visits |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        101        1.01        1.01
          1 |         38        0.38        1.39
          2 |         99        0.99        2.38
          3 |        177        1.77        4.15
          4 |        232        2.32        6.47
          5 |        335        3.35        9.82
          6 |        438        4.38       14.20
          7 |        536        5.36       19.56
          8 |        761        7.61       27.17
          9 |        909        9.09       36.26
         10 |      1,220       12.20       48.46
         11 |        995        9.95       58.41
         12 |      1,046       10.46       68.87
         13 |        782        7.82       76.69
         14 |        593        5.93       82.62
         15 |        416        4.16       86.78
         16 |        266        2.66       89.44
         17 |        159        1.59       91.03
         18 |        113        1.13       92.16
         19 |         75        0.75       92.91
         20 |         69        0.69       93.60
         21 |         45        0.45       94.05
         22 |         37        0.37       94.42
         23 |         34        0.34       94.76
         24 |         25        0.25       95.01
         25 |         11        0.11       95.12
         26 |          8        0.08       95.20
         27 |         10        0.10       95.30
         28 |          6        0.06       95.36
         29 |         10        0.10       95.46
         30 |          4        0.04       95.50
         31 |          1        0.01       95.51
         32 |          2        0.02       95.53
         34 |          1        0.01       95.54
         35 |          2        0.02       95.56
         36 |          1        0.01       95.57
         42 |          1        0.01       95.58
         99 |        442        4.42      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016