Frequencies for first 10,000 rows of estgest variable in natlterr2009 dataset :

Obstetric/C |
    linical |
  Gestation |
   Est. RFP |
573=f_cline |
     st U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          7 |          1        0.01        0.01
         14 |          1        0.01        0.02
         15 |          1        0.01        0.03
         18 |          3        0.03        0.06
         20 |          3        0.03        0.09
         21 |          3        0.03        0.12
         22 |          6        0.06        0.18
         23 |          6        0.06        0.24
         24 |         13        0.13        0.37
         25 |         15        0.15        0.52
         26 |         16        0.16        0.68
         27 |         20        0.20        0.88
         28 |         14        0.14        1.02
         29 |         22        0.22        1.24
         30 |         35        0.35        1.59
         31 |         45        0.45        2.04
         32 |         62        0.62        2.66
         33 |         91        0.91        3.57
         34 |        158        1.58        5.15
         35 |        268        2.68        7.83
         36 |        603        6.03       13.86
         37 |      1,425       14.25       28.11
         38 |      2,298       22.98       51.09
         39 |      1,904       19.04       70.13
         40 |      1,148       11.48       81.61
         41 |        317        3.17       84.78
         42 |         95        0.95       85.73
         43 |         50        0.50       86.23
         44 |         19        0.19       86.42
         45 |          5        0.05       86.47
         99 |      1,353       13.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015