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

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,871       98.71       98.71
          2 |         88        0.88       99.59
          3 |         21        0.21       99.80
          4 |         10        0.10       99.90
          5 |          3        0.03       99.93
          6 |          1        0.01       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 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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