Frequencies for first 10,000 rows of previs variable in natl2017 dataset :

  Number of |
   Prenatal |
     Visits |
   (Revised |
only) 00-98 |
  Number of |
   prenatal |
     visits |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        110        1.10        1.10
          1 |         45        0.45        1.55
          2 |         99        0.99        2.54
          3 |        177        1.77        4.31
          4 |        222        2.22        6.53
          5 |        331        3.31        9.84
          6 |        437        4.37       14.21
          7 |        510        5.10       19.31
          8 |        708        7.08       26.39
          9 |        867        8.67       35.06
         10 |      1,185       11.85       46.91
         11 |      1,017       10.17       57.08
         12 |      1,101       11.01       68.09
         13 |        896        8.96       77.05
         14 |        614        6.14       83.19
         15 |        421        4.21       87.40
         16 |        271        2.71       90.11
         17 |        178        1.78       91.89
         18 |        130        1.30       93.19
         19 |        114        1.14       94.33
         20 |         87        0.87       95.20
         21 |         52        0.52       95.72
         22 |         38        0.38       96.10
         23 |         27        0.27       96.37
         24 |         25        0.25       96.62
         25 |         16        0.16       96.78
         26 |          7        0.07       96.85
         27 |         13        0.13       96.98
         28 |          6        0.06       97.04
         29 |          3        0.03       97.07
         30 |          9        0.09       97.16
         31 |          4        0.04       97.20
         32 |          3        0.03       97.23
         33 |          2        0.02       97.25
         34 |          1        0.01       97.26
         36 |          2        0.02       97.28
         39 |          2        0.02       97.30
         47 |          1        0.01       97.31
         99 |        269        2.69      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018