Frequencies for first 10,000 rows of a3 variable in midrvacc dataset :

         a3 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      6,733       67.33       67.33
          1 |         55        0.55       67.88
          2 |         74        0.74       68.62
          3 |         57        0.57       69.19
          4 |         64        0.64       69.83
          5 |         57        0.57       70.40
          6 |         77        0.77       71.17
          7 |         96        0.96       72.13
          8 |         79        0.79       72.92
          9 |         90        0.90       73.82
         10 |        100        1.00       74.82
         11 |        154        1.54       76.36
         12 |        127        1.27       77.63
         13 |        133        1.33       78.96
         14 |        162        1.62       80.58
         15 |        153        1.53       82.11
         16 |        151        1.51       83.62
         17 |        156        1.56       85.18
         18 |        177        1.77       86.95
         19 |        144        1.44       88.39
         20 |        154        1.54       89.93
         21 |        146        1.46       91.39
         22 |        134        1.34       92.73
         23 |        103        1.03       93.76
         24 |        100        1.00       94.76
         25 |         98        0.98       95.74
         26 |         88        0.88       96.62
         27 |         53        0.53       97.15
         28 |         49        0.49       97.64
         29 |         40        0.40       98.04
         30 |         48        0.48       98.52
         31 |         28        0.28       98.80
         32 |         19        0.19       98.99
         33 |         21        0.21       99.20
         34 |         11        0.11       99.31
         35 |         12        0.12       99.43
         36 |         13        0.13       99.56
         37 |         10        0.10       99.66
         38 |          4        0.04       99.70
         39 |          3        0.03       99.73
         40 |          3        0.03       99.76
         41 |          3        0.03       99.79
         42 |          3        0.03       99.82
         43 |          2        0.02       99.84
         44 |          5        0.05       99.89
         47 |          1        0.01       99.90
         48 |          2        0.02       99.92
         50 |          2        0.02       99.94
         59 |          1        0.01       99.95
         67 |          1        0.01       99.96
         68 |          1        0.01       99.97
         79 |          1        0.01       99.98
         94 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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