Frequencies for first 10,000 rows of uprevis variable in natlterr2011 dataset :

  Number of |
   Prenatal |
 Visits U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        251        2.51        2.51
          1 |         64        0.64        3.15
          2 |         76        0.76        3.91
          3 |        121        1.21        5.12
          4 |        159        1.59        6.71
          5 |        264        2.64        9.35
          6 |        315        3.15       12.50
          7 |        377        3.77       16.27
          8 |        507        5.07       21.34
          9 |        593        5.93       27.27
         10 |      1,079       10.79       38.06
         11 |        646        6.46       44.52
         12 |        885        8.85       53.37
         13 |        520        5.20       58.57
         14 |        457        4.57       63.14
         15 |        386        3.86       67.00
         16 |        213        2.13       69.13
         17 |         91        0.91       70.04
         18 |         83        0.83       70.87
         19 |         37        0.37       71.24
         20 |         92        0.92       72.16
         21 |         15        0.15       72.31
         22 |         15        0.15       72.46
         23 |          4        0.04       72.50
         24 |          3        0.03       72.53
         25 |         10        0.10       72.63
         26 |          2        0.02       72.65
         27 |          1        0.01       72.66
         28 |          4        0.04       72.70
         35 |          1        0.01       72.71
         38 |          1        0.01       72.72
         40 |          1        0.01       72.73
         49 |          3        0.03       72.76
         99 |      2,724       27.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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