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

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        628        6.28        6.28
          1 |      1,750       17.50       23.78
          2 |         15        0.15       23.93
          8 |          4        0.04       23.97
          9 |         54        0.54       24.51
         20 |      1,334       13.34       37.85
         28 |          2        0.02       37.87
         29 |      1,333       13.33       51.20
         30 |      4,464       44.64       95.84
         31 |          4        0.04       95.88
         32 |          3        0.03       95.91
         99 |        409        4.09      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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