Frequencies for first 10,000 rows of combgest variable in natl2015 dataset :

   Combined |
  Gestation |
  -- Detail |
   in Weeks |
 17-47 17th |
    through |
  47th week |
         of |      Freq.     Percent        Cum.
------------+-----------------------------------
         19 |          5        0.05        0.05
         20 |          1        0.01        0.06
         21 |          2        0.02        0.08
         22 |          2        0.02        0.10
         23 |          4        0.04        0.14
         24 |          7        0.07        0.21
         25 |         16        0.16        0.37
         26 |          9        0.09        0.46
         27 |          9        0.09        0.55
         28 |         12        0.12        0.67
         29 |         20        0.20        0.87
         30 |         21        0.21        1.08
         31 |         34        0.34        1.42
         32 |         50        0.50        1.92
         33 |         73        0.73        2.65
         34 |        144        1.44        4.09
         35 |        209        2.09        6.18
         36 |        404        4.04       10.22
         37 |        890        8.90       19.12
         38 |      1,508       15.08       34.20
         39 |      2,648       26.48       60.68
         40 |      2,114       21.14       81.82
         41 |      1,111       11.11       92.93
         42 |        338        3.38       96.31
         43 |        174        1.74       98.05
         44 |         80        0.80       98.85
         45 |         58        0.58       99.43
         46 |         35        0.35       99.78
         47 |         12        0.12       99.90
         99 |         10        0.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 20 Oct 2016