Frequencies for a5 variable in midrvacc dataset :

         a5 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        286       61.64       61.64
          1 |          1        0.22       61.85
          2 |          6        1.29       63.15
          3 |          5        1.08       64.22
          4 |          4        0.86       65.09
          5 |          4        0.86       65.95
          6 |          2        0.43       66.38
          7 |          4        0.86       67.24
          8 |          9        1.94       69.18
          9 |          3        0.65       69.83
         10 |          8        1.72       71.55
         11 |          7        1.51       73.06
         12 |          8        1.72       74.78
         13 |          4        0.86       75.65
         14 |         13        2.80       78.45
         15 |         12        2.59       81.03
         16 |          7        1.51       82.54
         17 |         10        2.16       84.70
         18 |          2        0.43       85.13
         19 |         13        2.80       87.93
         20 |          9        1.94       89.87
         21 |          4        0.86       90.73
         22 |          7        1.51       92.24
         23 |          3        0.65       92.89
         24 |          4        0.86       93.75
         25 |          4        0.86       94.61
         26 |          2        0.43       95.04
         27 |          4        0.86       95.91
         28 |          6        1.29       97.20
         29 |          3        0.65       97.84
         30 |          1        0.22       98.06
         31 |          2        0.43       98.49
         32 |          2        0.43       98.92
         33 |          2        0.43       99.35
         34 |          1        0.22       99.57
         36 |          1        0.22       99.78
         39 |          1        0.22      100.00
------------+-----------------------------------
      Total |        464      100.00

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