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

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        622        6.22        6.22
          1 |      1,737       17.37       23.59
          2 |         18        0.18       23.77
          8 |         16        0.16       23.93
          9 |        143        1.43       25.36
         20 |      1,206       12.06       37.42
         29 |      1,729       17.29       54.71
         30 |      4,090       40.90       95.61
         32 |          1        0.01       95.62
         99 |        438        4.38      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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