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

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,842       98.42       98.42
          2 |        108        1.08       99.50
          3 |         27        0.27       99.77
          4 |          9        0.09       99.86
          5 |          5        0.05       99.91
          6 |          3        0.03       99.94
          7 |          1        0.01       99.95
          8 |          1        0.01       99.96
          9 |          1        0.01       99.97
         10 |          1        0.01       99.98
         11 |          1        0.01       99.99
         12 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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