Frequencies for first 10,000 rows of nprev28 variable in natl1985 dataset :

  Number of |
   Prenatal |
     Visits |
     Recode |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        158        1.58        1.58
          2 |         96        0.96        2.54
          3 |        161        1.61        4.15
          4 |        205        2.05        6.20
          5 |        242        2.42        8.62
          6 |        355        3.55       12.17
          7 |        424        4.24       16.41
          8 |        450        4.50       20.91
          9 |        632        6.32       27.23
         10 |        618        6.18       33.41
         11 |      1,162       11.62       45.03
         12 |        881        8.81       53.84
         13 |      1,674       16.74       70.58
         14 |        778        7.78       78.36
         15 |        875        8.75       87.11
         16 |        550        5.50       92.61
         17 |        237        2.37       94.98
         18 |        105        1.05       96.03
         19 |         89        0.89       96.92
         20 |         48        0.48       97.40
         21 |         90        0.90       98.30
         22 |         25        0.25       98.55
         23 |         11        0.11       98.66
         24 |         14        0.14       98.80
         25 |          9        0.09       98.89
         26 |         11        0.11       99.00
         27 |         19        0.19       99.19
         28 |         81        0.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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