Frequencies for first 10,000 rows of uprevis variable in natlterr2005 dataset :

  Number of |
   Prenatal |
 Visits U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        275        2.75        2.75
          1 |         86        0.86        3.61
          2 |        146        1.46        5.07
          3 |        221        2.21        7.28
          4 |        249        2.49        9.77
          5 |        340        3.40       13.17
          6 |        450        4.50       17.67
          7 |        502        5.02       22.69
          8 |        650        6.50       29.19
          9 |        676        6.76       35.95
         10 |      1,307       13.07       49.02
         11 |        634        6.34       55.36
         12 |        919        9.19       64.55
         13 |        419        4.19       68.74
         14 |        354        3.54       72.28
         15 |        448        4.48       76.76
         16 |        138        1.38       78.14
         17 |         89        0.89       79.03
         18 |         72        0.72       79.75
         19 |         29        0.29       80.04
         20 |        128        1.28       81.32
         21 |          9        0.09       81.41
         22 |          6        0.06       81.47
         23 |          4        0.04       81.51
         24 |         11        0.11       81.62
         25 |         14        0.14       81.76
         26 |          1        0.01       81.77
         27 |          1        0.01       81.78
         28 |          1        0.01       81.79
         30 |         13        0.13       81.92
         31 |          2        0.02       81.94
         34 |          1        0.01       81.95
         37 |          1        0.01       81.96
         38 |          2        0.02       81.98
         39 |          3        0.03       82.01
         40 |          7        0.07       82.08
         41 |          1        0.01       82.09
         43 |          1        0.01       82.10
         49 |          1        0.01       82.11
         99 |      1,789       17.89      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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