Frequencies for first 10,000 rows of a4 variable in miacc dataset :

         a4 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      4,503       45.03       45.03
          1 |         51        0.51       45.54
          2 |         92        0.92       46.46
          3 |        123        1.23       47.69
          4 |        122        1.22       48.91
          5 |        122        1.22       50.13
          6 |        133        1.33       51.46
          7 |        155        1.55       53.01
          8 |        149        1.49       54.50
          9 |        196        1.96       56.46
         10 |        216        2.16       58.62
         11 |        230        2.30       60.92
         12 |        235        2.35       63.27
         13 |        256        2.56       65.83
         14 |        247        2.47       68.30
         15 |        260        2.60       70.90
         16 |        268        2.68       73.58
         17 |        266        2.66       76.24
         18 |        268        2.68       78.92
         19 |        236        2.36       81.28
         20 |        226        2.26       83.54
         21 |        209        2.09       85.63
         22 |        225        2.25       87.88
         23 |        174        1.74       89.62
         24 |        160        1.60       91.22
         25 |        141        1.41       92.63
         26 |        122        1.22       93.85
         27 |        112        1.12       94.97
         28 |         88        0.88       95.85
         29 |         84        0.84       96.69
         30 |         83        0.83       97.52
         31 |         37        0.37       97.89
         32 |         40        0.40       98.29
         33 |         34        0.34       98.63
         34 |         23        0.23       98.86
         35 |         12        0.12       98.98
         36 |         12        0.12       99.10
         37 |         16        0.16       99.26
         38 |         17        0.17       99.43
         39 |          8        0.08       99.51
         40 |          8        0.08       99.59
         41 |          4        0.04       99.63
         42 |          6        0.06       99.69
         43 |          7        0.07       99.76
         44 |          6        0.06       99.82
         45 |          4        0.04       99.86
         46 |          2        0.02       99.88
         47 |          2        0.02       99.90
         48 |          1        0.01       99.91
         49 |          2        0.02       99.93
         51 |          1        0.01       99.94
         53 |          1        0.01       99.95
         56 |          1        0.01       99.96
         57 |          1        0.01       99.97
         62 |          1        0.01       99.98
         66 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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