Frequencies for a3 variable in miacc dataset :

         a3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        238       51.18       51.18
          1 |          1        0.22       51.40
          2 |          6        1.29       52.69
          3 |          4        0.86       53.55
          4 |          5        1.08       54.62
          5 |          5        1.08       55.70
          6 |          1        0.22       55.91
          7 |          3        0.65       56.56
          8 |          8        1.72       58.28
          9 |          7        1.51       59.78
         10 |          5        1.08       60.86
         11 |          9        1.94       62.80
         12 |         12        2.58       65.38
         13 |         13        2.80       68.17
         14 |         11        2.37       70.54
         15 |         13        2.80       73.33
         16 |          9        1.94       75.27
         17 |          8        1.72       76.99
         18 |          6        1.29       78.28
         19 |         15        3.23       81.51
         20 |         12        2.58       84.09
         21 |          7        1.51       85.59
         22 |         10        2.15       87.74
         23 |          7        1.51       89.25
         24 |          6        1.29       90.54
         25 |          4        0.86       91.40
         26 |          4        0.86       92.26
         27 |          5        1.08       93.33
         28 |          7        1.51       94.84
         29 |          6        1.29       96.13
         30 |          3        0.65       96.77
         31 |          4        0.86       97.63
         32 |          3        0.65       98.28
         34 |          1        0.22       98.49
         35 |          1        0.22       98.71
         36 |          2        0.43       99.14
         37 |          1        0.22       99.35
         39 |          1        0.22       99.57
         41 |          1        0.22       99.78
         43 |          1        0.22      100.00
------------+-----------------------------------
      Total |        465      100.00

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