Frequencies for first 10,000 rows of uprevis variable in natl2006 dataset :

  Number of |
   Prenatal |
 Visits U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         38        0.38        0.38
          1 |         75        0.75        1.13
          2 |        106        1.06        2.19
          3 |        170        1.70        3.89
          4 |        232        2.32        6.21
          5 |        303        3.03        9.24
          6 |        378        3.78       13.02
          7 |        504        5.04       18.06
          8 |        713        7.13       25.19
          9 |        730        7.30       32.49
         10 |      1,223       12.23       44.72
         11 |        829        8.29       53.01
         12 |      1,411       14.11       67.12
         13 |        620        6.20       73.32
         14 |        583        5.83       79.15
         15 |        656        6.56       85.71
         16 |        193        1.93       87.64
         17 |        102        1.02       88.66
         18 |         91        0.91       89.57
         19 |         29        0.29       89.86
         20 |        239        2.39       92.25
         21 |         12        0.12       92.37
         22 |         10        0.10       92.47
         23 |          7        0.07       92.54
         24 |         17        0.17       92.71
         25 |         31        0.31       93.02
         26 |          4        0.04       93.06
         28 |          4        0.04       93.10
         29 |          3        0.03       93.13
         30 |         26        0.26       93.39
         32 |          1        0.01       93.40
         35 |          4        0.04       93.44
         37 |          1        0.01       93.45
         38 |          1        0.01       93.46
         39 |          1        0.01       93.47
         40 |          6        0.06       93.53
         41 |          1        0.01       93.54
         43 |          1        0.01       93.55
         49 |          6        0.06       93.61
         99 |        639        6.39      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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