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

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        725        7.25        7.25
          1 |        782        7.82       15.07
          8 |          2        0.02       15.09
          9 |          5        0.05       15.14
         20 |        206        2.06       17.20
         28 |          1        0.01       17.21
         29 |        697        6.97       24.18
         30 |      6,459       64.59       88.77
         31 |          2        0.02       88.79
         32 |          3        0.03       88.82
         99 |      1,118       11.18      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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