Frequencies for air_bag variable in person dataset :

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        193       17.92       17.92
          1 |          4        0.37       18.29
          2 |          1        0.09       18.38
         20 |          1        0.09       18.48
         29 |        356       33.05       51.53
         30 |        465       43.18       94.71
         99 |         57        5.29      100.00
------------+-----------------------------------
      Total |      1,077      100.00

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