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

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        682        6.82        6.82
          1 |        976        9.76       16.58
          2 |          1        0.01       16.59
          9 |          3        0.03       16.62
         20 |        358        3.58       20.20
         29 |      1,216       12.16       32.36
         30 |      6,388       63.88       96.24
         31 |          2        0.02       96.26
         32 |          1        0.01       96.27
         99 |        373        3.73      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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