Frequencies for a9 variable in miacc dataset :

         a9 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        198       51.56       51.56
          1 |          3        0.78       52.34
          2 |          8        2.08       54.43
          3 |          3        0.78       55.21
          4 |          6        1.56       56.77
          5 |          6        1.56       58.33
          6 |          7        1.82       60.16
          7 |          2        0.52       60.68
          8 |          3        0.78       61.46
          9 |          6        1.56       63.02
         10 |          6        1.56       64.58
         11 |          9        2.34       66.93
         12 |          6        1.56       68.49
         13 |          7        1.82       70.31
         14 |          8        2.08       72.40
         15 |         12        3.12       75.52
         16 |          8        2.08       77.60
         17 |          6        1.56       79.17
         18 |          7        1.82       80.99
         19 |          6        1.56       82.55
         20 |         12        3.12       85.68
         21 |          8        2.08       87.76
         22 |          7        1.82       89.58
         23 |          5        1.30       90.89
         24 |          8        2.08       92.97
         25 |          5        1.30       94.27
         26 |          6        1.56       95.83
         27 |          3        0.78       96.61
         28 |          1        0.26       96.88
         29 |          2        0.52       97.40
         30 |          1        0.26       97.66
         32 |          2        0.52       98.18
         34 |          1        0.26       98.44
         36 |          3        0.78       99.22
         38 |          1        0.26       99.48
         40 |          1        0.26       99.74
         42 |          1        0.26      100.00
------------+-----------------------------------
      Total |        384      100.00

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