Frequencies for first 10,000 rows of per_no variable in miper dataset :

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,891       98.91       98.91
          2 |         74        0.74       99.65
          3 |         17        0.17       99.82
          4 |          6        0.06       99.88
          5 |          3        0.03       99.91
          6 |          1        0.01       99.92
          7 |          1        0.01       99.93
          8 |          1        0.01       99.94
          9 |          1        0.01       99.95
         10 |          1        0.01       99.96
         11 |          1        0.01       99.97
         12 |          1        0.01       99.98
         13 |          1        0.01       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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