Frequencies for first 10,000 rows of previs variable in natl2014 dataset :

  Number of |
   Prenatal |
     Visits |
   (Revised |
only) 00-98 |
  Number of |
   prenatal |
     visits |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         81        0.81        0.81
          1 |         45        0.45        1.26
          2 |         98        0.98        2.24
          3 |        180        1.80        4.04
          4 |        257        2.57        6.61
          5 |        355        3.55       10.16
          6 |        487        4.87       15.03
          7 |        551        5.51       20.54
          8 |        748        7.48       28.02
          9 |        862        8.62       36.64
         10 |      1,206       12.06       48.70
         11 |      1,011       10.11       58.81
         12 |        948        9.48       68.29
         13 |        721        7.21       75.50
         14 |        535        5.35       80.85
         15 |        401        4.01       84.86
         16 |        224        2.24       87.10
         17 |        129        1.29       88.39
         18 |        103        1.03       89.42
         19 |         66        0.66       90.08
         20 |         68        0.68       90.76
         21 |         23        0.23       90.99
         22 |         29        0.29       91.28
         23 |         12        0.12       91.40
         24 |         18        0.18       91.58
         25 |          6        0.06       91.64
         26 |         13        0.13       91.77
         27 |         10        0.10       91.87
         28 |          6        0.06       91.93
         29 |          2        0.02       91.95
         30 |          9        0.09       92.04
         31 |          1        0.01       92.05
         32 |          2        0.02       92.07
         33 |          2        0.02       92.09
         35 |          1        0.01       92.10
         39 |          1        0.01       92.11
         40 |          2        0.02       92.13
         45 |          3        0.03       92.16
         46 |          1        0.01       92.17
         49 |          1        0.01       92.18
         99 |        782        7.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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