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

    AIR BAG |
AVAILABILIT |
 Y/FUNCTION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        615        6.15        6.15
          1 |      2,016       20.16       26.31
          2 |         55        0.55       26.86
          7 |          3        0.03       26.89
          8 |         15        0.15       27.04
          9 |        147        1.47       28.51
         20 |      1,514       15.14       43.65
         28 |          2        0.02       43.67
         29 |      1,315       13.15       56.82
         30 |      3,984       39.84       96.66
         31 |          2        0.02       96.68
         32 |          3        0.03       96.71
         99 |        329        3.29      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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