Frequencies for first 10,000 rows of uprevis variable in natlterr2006 dataset :

  Number of |
   Prenatal |
 Visits U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        327        3.27        3.27
          1 |        102        1.02        4.29
          2 |        150        1.50        5.79
          3 |        190        1.90        7.69
          4 |        265        2.65       10.34
          5 |        354        3.54       13.88
          6 |        453        4.53       18.41
          7 |        466        4.66       23.07
          8 |        708        7.08       30.15
          9 |        648        6.48       36.63
         10 |      1,367       13.67       50.30
         11 |        658        6.58       56.88
         12 |        975        9.75       66.63
         13 |        427        4.27       70.90
         14 |        374        3.74       74.64
         15 |        417        4.17       78.81
         16 |        182        1.82       80.63
         17 |         81        0.81       81.44
         18 |         88        0.88       82.32
         19 |         31        0.31       82.63
         20 |        127        1.27       83.90
         21 |          6        0.06       83.96
         22 |         13        0.13       84.09
         23 |          2        0.02       84.11
         24 |         12        0.12       84.23
         25 |         15        0.15       84.38
         26 |          4        0.04       84.42
         27 |          2        0.02       84.44
         28 |          4        0.04       84.48
         30 |         14        0.14       84.62
         32 |          2        0.02       84.64
         34 |          2        0.02       84.66
         37 |          1        0.01       84.67
         38 |          3        0.03       84.70
         39 |          2        0.02       84.72
         40 |          7        0.07       84.79
         47 |          1        0.01       84.80
         99 |      1,520       15.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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