Frequencies for first 10,000 rows of uprevis variable in natlterr2003 dataset :

  Number of |
   Prenatal |
 Visits U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         71        0.71        0.71
          1 |         16        0.16        0.87
          2 |         39        0.39        1.26
          3 |         65        0.65        1.91
          4 |        128        1.28        3.19
          5 |        206        2.06        5.25
          6 |        327        3.27        8.52
          7 |        411        4.11       12.63
          8 |        691        6.91       19.54
          9 |        718        7.18       26.72
         10 |      1,986       19.86       46.58
         11 |        808        8.08       54.66
         12 |      1,704       17.04       71.70
         13 |        756        7.56       79.26
         14 |        630        6.30       85.56
         15 |        703        7.03       92.59
         16 |        264        2.64       95.23
         17 |        107        1.07       96.30
         18 |        143        1.43       97.73
         19 |         52        0.52       98.25
         20 |         88        0.88       99.13
         21 |         17        0.17       99.30
         22 |         16        0.16       99.46
         23 |          5        0.05       99.51
         24 |          4        0.04       99.55
         25 |         14        0.14       99.69
         26 |          3        0.03       99.72
         27 |          1        0.01       99.73
         28 |          2        0.02       99.75
         30 |          7        0.07       99.82
         31 |          1        0.01       99.83
         32 |          1        0.01       99.84
         35 |          1        0.01       99.85
         38 |          1        0.01       99.86
         40 |         10        0.10       99.96
         99 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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