Frequencies for first 10,000 rows of nprev28 variable in natl1980 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        125        1.25        1.25
          2 |        122        1.22        2.47
          3 |        211        2.11        4.58
          4 |        259        2.59        7.17
          5 |        312        3.12       10.29
          6 |        394        3.94       14.23
          7 |        531        5.31       19.54
          8 |        588        5.88       25.42
          9 |        754        7.54       32.96
         10 |        772        7.72       40.68
         11 |      1,156       11.56       52.24
         12 |        756        7.56       59.80
         13 |      1,478       14.78       74.58
         14 |        756        7.56       82.14
         15 |        727        7.27       89.41
         16 |        444        4.44       93.85
         17 |        177        1.77       95.62
         18 |         78        0.78       96.40
         19 |         97        0.97       97.37
         20 |         23        0.23       97.60
         21 |         84        0.84       98.44
         22 |         15        0.15       98.59
         23 |          6        0.06       98.65
         24 |          3        0.03       98.68
         25 |          4        0.04       98.72
         26 |         12        0.12       98.84
         27 |         17        0.17       99.01
         28 |         99        0.99      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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