Frequencies for first 10,000 rows of uprevis variable in natl2004 dataset :

  Number of |
   Prenatal |
 Visits U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         36        0.36        0.36
          1 |         68        0.68        1.04
          2 |        102        1.02        2.06
          3 |        156        1.56        3.62
          4 |        222        2.22        5.84
          5 |        349        3.49        9.33
          6 |        370        3.70       13.03
          7 |        436        4.36       17.39
          8 |        615        6.15       23.54
          9 |        688        6.88       30.42
         10 |      1,125       11.25       41.67
         11 |        803        8.03       49.70
         12 |      1,379       13.79       63.49
         13 |        638        6.38       69.87
         14 |        559        5.59       75.46
         15 |        618        6.18       81.64
         16 |        203        2.03       83.67
         17 |         81        0.81       84.48
         18 |         87        0.87       85.35
         19 |         23        0.23       85.58
         20 |        217        2.17       87.75
         21 |         11        0.11       87.86
         22 |         16        0.16       88.02
         23 |          6        0.06       88.08
         24 |         15        0.15       88.23
         25 |         34        0.34       88.57
         26 |          4        0.04       88.61
         27 |          2        0.02       88.63
         28 |          6        0.06       88.69
         29 |          1        0.01       88.70
         30 |         31        0.31       89.01
         33 |          1        0.01       89.02
         35 |          4        0.04       89.06
         36 |          2        0.02       89.08
         37 |          1        0.01       89.09
         38 |          1        0.01       89.10
         39 |          1        0.01       89.11
         40 |          7        0.07       89.18
         49 |          4        0.04       89.22
         99 |      1,078       10.78      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 21 Jan 2016