Frequencies for a10 variable in midrvacc dataset :

        a10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        293       63.15       63.15
          1 |          1        0.22       63.36
          2 |          5        1.08       64.44
          3 |          4        0.86       65.30
          4 |          3        0.65       65.95
          5 |          2        0.43       66.38
          6 |          1        0.22       66.59
          7 |          5        1.08       67.67
          8 |          7        1.51       69.18
          9 |          5        1.08       70.26
         10 |          5        1.08       71.34
         11 |          7        1.51       72.84
         12 |          8        1.72       74.57
         13 |          5        1.08       75.65
         14 |          7        1.51       77.16
         15 |         15        3.23       80.39
         16 |          9        1.94       82.33
         17 |          7        1.51       83.84
         18 |          1        0.22       84.05
         19 |         13        2.80       86.85
         20 |          8        1.72       88.58
         21 |          3        0.65       89.22
         22 |          9        1.94       91.16
         23 |          7        1.51       92.67
         24 |          3        0.65       93.32
         25 |          3        0.65       93.97
         26 |          3        0.65       94.61
         27 |          4        0.86       95.47
         28 |          6        1.29       96.77
         29 |          4        0.86       97.63
         30 |          2        0.43       98.06
         31 |          2        0.43       98.49
         32 |          1        0.22       98.71
         33 |          1        0.22       98.92
         34 |          2        0.43       99.35
         36 |          1        0.22       99.57
         37 |          1        0.22       99.78
         39 |          1        0.22      100.00
------------+-----------------------------------
      Total |        464      100.00

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