Frequencies for first 10,000 rows of a7 variable in midrvacc dataset :

         a7 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,484       64.84       64.84
          1 |         44        0.44       65.28
          2 |         79        0.79       66.07
          3 |         79        0.79       66.86
          4 |         80        0.80       67.66
          5 |         71        0.71       68.37
          6 |         92        0.92       69.29
          7 |        103        1.03       70.32
          8 |        116        1.16       71.48
          9 |        100        1.00       72.48
         10 |        120        1.20       73.68
         11 |        168        1.68       75.36
         12 |        147        1.47       76.83
         13 |        151        1.51       78.34
         14 |        157        1.57       79.91
         15 |        168        1.68       81.59
         16 |        179        1.79       83.38
         17 |        162        1.62       85.00
         18 |        167        1.67       86.67
         19 |        160        1.60       88.27
         20 |        145        1.45       89.72
         21 |        135        1.35       91.07
         22 |        174        1.74       92.81
         23 |        115        1.15       93.96
         24 |        124        1.24       95.20
         25 |         83        0.83       96.03
         26 |         70        0.70       96.73
         27 |         55        0.55       97.28
         28 |         66        0.66       97.94
         29 |         36        0.36       98.30
         30 |         35        0.35       98.65
         31 |         34        0.34       98.99
         32 |         17        0.17       99.16
         33 |         15        0.15       99.31
         34 |          9        0.09       99.40
         35 |          8        0.08       99.48
         36 |         11        0.11       99.59
         37 |          5        0.05       99.64
         38 |          9        0.09       99.73
         39 |          6        0.06       99.79
         40 |          3        0.03       99.82
         41 |          2        0.02       99.84
         42 |          5        0.05       99.89
         43 |          2        0.02       99.91
         44 |          2        0.02       99.93
         45 |          3        0.03       99.96
         47 |          3        0.03       99.99
         51 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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