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

     per_no |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      9,875       98.75       98.75
          2 |        103        1.03       99.78
          3 |         15        0.15       99.93
          4 |          3        0.03       99.96
          5 |          3        0.03       99.99
          6 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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