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

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,861       98.61       98.61
          2 |         98        0.98       99.59
          3 |         21        0.21       99.80
          4 |         13        0.13       99.93
          5 |          4        0.04       99.97
          6 |          2        0.02       99.99
         14 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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