Frequencies for first 10,000 rows of nprev28 variable in natl1988 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        206        2.06        2.06
          2 |         69        0.69        2.75
          3 |        109        1.09        3.84
          4 |        155        1.55        5.39
          5 |        227        2.27        7.66
          6 |        260        2.60       10.26
          7 |        357        3.57       13.83
          8 |        380        3.80       17.63
          9 |        551        5.51       23.14
         10 |        600        6.00       29.14
         11 |      1,147       11.47       40.61
         12 |        881        8.81       49.42
         13 |      1,644       16.44       65.86
         14 |        845        8.45       74.31
         15 |        776        7.76       82.07
         16 |        586        5.86       87.93
         17 |        338        3.38       91.31
         18 |        150        1.50       92.81
         19 |        109        1.09       93.90
         20 |         54        0.54       94.44
         21 |        121        1.21       95.65
         22 |         14        0.14       95.79
         23 |         17        0.17       95.96
         24 |         10        0.10       96.06
         25 |         18        0.18       96.24
         26 |         20        0.20       96.44
         27 |         36        0.36       96.80
         28 |        320        3.20      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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