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

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        569        5.69        5.69
          1 |      1,538       15.38       21.07
          2 |         13        0.13       21.20
          8 |          6        0.06       21.26
          9 |         25        0.25       21.51
         20 |        963        9.63       31.14
         28 |          3        0.03       31.17
         29 |      1,685       16.85       48.02
         30 |      4,784       47.84       95.86
         31 |          1        0.01       95.87
         32 |          5        0.05       95.92
         99 |        408        4.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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