Frequencies for first 10,000 rows of nprev28 variable in natl1982 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        191        1.91        1.91
          2 |        274        2.74        4.65
          3 |        180        1.80        6.45
          4 |        227        2.27        8.72
          5 |        256        2.56       11.28
          6 |        391        3.91       15.19
          7 |        476        4.76       19.95
          8 |        533        5.33       25.28
          9 |        677        6.77       32.05
         10 |        681        6.81       38.86
         11 |      1,211       12.11       50.97
         12 |        764        7.64       58.61
         13 |      1,604       16.04       74.65
         14 |        558        5.58       80.23
         15 |        785        7.85       88.08
         16 |        557        5.57       93.65
         17 |        245        2.45       96.10
         18 |         78        0.78       96.88
         19 |         85        0.85       97.73
         20 |         35        0.35       98.08
         21 |         80        0.80       98.88
         22 |         13        0.13       99.01
         23 |          9        0.09       99.10
         24 |          4        0.04       99.14
         25 |          5        0.05       99.19
         26 |          6        0.06       99.25
         27 |         17        0.17       99.42
         28 |         58        0.58      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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