Frequencies for first 10,000 rows of uprevis variable in natlterr2008 dataset :

  Number of |
   Prenatal |
 Visits U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        365        3.65        3.65
          1 |        130        1.30        4.95
          2 |        189        1.89        6.84
          3 |        230        2.30        9.14
          4 |        308        3.08       12.22
          5 |        376        3.76       15.98
          6 |        458        4.58       20.56
          7 |        417        4.17       24.73
          8 |        571        5.71       30.44
          9 |        615        6.15       36.59
         10 |      1,225       12.25       48.84
         11 |        649        6.49       55.33
         12 |        991        9.91       65.24
         13 |        479        4.79       70.03
         14 |        472        4.72       74.75
         15 |        421        4.21       78.96
         16 |        209        2.09       81.05
         17 |         87        0.87       81.92
         18 |         67        0.67       82.59
         19 |         35        0.35       82.94
         20 |        123        1.23       84.17
         21 |          6        0.06       84.23
         22 |          9        0.09       84.32
         23 |          3        0.03       84.35
         24 |         10        0.10       84.45
         25 |         20        0.20       84.65
         26 |          1        0.01       84.66
         28 |          4        0.04       84.70
         29 |          1        0.01       84.71
         30 |         13        0.13       84.84
         32 |          1        0.01       84.85
         33 |          1        0.01       84.86
         35 |          3        0.03       84.89
         36 |          3        0.03       84.92
         37 |          3        0.03       84.95
         38 |          7        0.07       85.02
         39 |          4        0.04       85.06
         40 |          4        0.04       85.10
         41 |          2        0.02       85.12
         42 |          2        0.02       85.14
         49 |          3        0.03       85.17
         99 |      1,483       14.83      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 3 May 2016