Frequencies for first 10,000 rows of air_bag variable in person dataset :

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        665        6.65        6.65
          1 |      1,831       18.31       24.96
          2 |         56        0.56       25.52
          8 |         45        0.45       25.97
          9 |        379        3.79       29.76
         20 |      1,905       19.05       48.81
         29 |        926        9.26       58.07
         30 |      3,904       39.04       97.11
         31 |          5        0.05       97.16
         32 |          3        0.03       97.19
         99 |        281        2.81      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 18 Apr 2016